I started hiding demos, goodie packs and other freebies I don't want to waste time/space on downloading (with gogrepo.py), as I'm not actually interested in and/or am never going to play them.

How many have you hidden and why?

I'm up to 143:

A.D. 2044
Alan Wake's American Nightmare
Alien Breed 2: Assault
Alien Breed 3: Descent
Alien Breed: Impact
Alwa's Awakening
AMID EVIL Demo
Ancient Enemy
Ascendant
BEAUTIFUL DESOLATION
Beholder 2
Betrayer
Biing!: Sex, Intrigue and Scalpels
Bio Menace
Bloody Hell
Book of Demons
Builders of Egypt: Prologue
Butcher
Caveblazers
CAYNE
Crusader Kings Il
Cyberpunk 2077 Goodies Collection
Daggerfall Unity - GOG Cut
Dagon: by H. P. Lovecraft
Daymare: 1998
Deadlight: Director's Cut
Deep Sky Derelicts
Desperados Ill Demo
Destroy All Humans! Clone Carnage
Destroy All Humans! Demo
Dex
Dink Smallwood HD
DISTRAINT: Deluxe Edition
Doomdark's Revenge
Dorfromantik Demo
Endless Sky
Eschalon: Book I
Eschalon: Book Il
Everdream Valley Goodies
Expeditions: Conquistador
Eye of the Beholder
Eye of the Beholder Il: The Legend of Darkmoon
Eye of the Beholder Ill: Assault on Myth Drannor
Fallout: London
Fantasy General
Fantasy General Il: Prologue
Fiendish Freddy's Big Top o' Fun
Final Liberation: Warhammer Epic 40,000
Gamedec Demo
Genesis Alpha One Deluxe Edition
Greak: Memories of Azur
GWENT: The Witcher Card Game
Hammerting
Hard West
Hell Division
Hellish Quart Demo
Hellpoint
Hellpoint: The Thespian Feast
I Have No Mouth And I Must Scream
Immortal Redneck
Inkulinati Goodies Pack
Iratus: Lord of the Dead
Iris and the Giant
Jotun: Valhalla Edition
Kathy Rain demo
King of Seas
Knights of Honor Il - Goodie Pack
Legend of Keepers: Career of a Dungeon Manager
Legend of Keepers: Prologue
LIMBO
Lorelai
Lost Ruins
Lovecraft's Untold Stories
Mable & The Wood
Metro: Last Light Redux
Mordheim: City of the Damned
Mount & Blade
Narita Boy
Neurodeck: Psychological Deckbuilder
Neverwinter Nights Diamond
Nomads of Driftland
Oddworld: Abe's Oddysee
Overload - Playable Teaser
Pile Up! Demo
Planet of Lana - Goodie Pack
POSTAL 2
POSTAL: Classic and Uncut
Prison Architect
Quake Il RTX
Relic Hunters Zero: Remix
Requiem: Avenging Angel
Samorost 1
Sang-Froid: Tales of Werewolves
Sanitarium
Scarlet Hood and the Wicked Wood Demo
Shadow Tactics: Blades of the Shogun Demo
Shadowrun Hong Kong - Extended Edition
Shadowrun Returns
Shadowrun: Dragonfall - Director's Cut
Sigma Theory: Global Cold War
SOMA
South of the Circle
Spring Sale Goodies Collection #1
Spring Sale Goodies Collection #2
Stargunner
STASIS
Steel RatsTM
Sunless Sea
SYMMETRY
Symphonia (Student Project, 2020)
System Shock Goodie Pack
TASOMACHI: Behind the Twilight - Demo
Teleglitch: Die More Edition
Terroir
THE KING OF FIGHTERS 2002
The Lords of Midnight
The Universim - DEMO
The Witcher Goodies Collection
The Witcher: Enhanced Edition
Thea 2: The Shattering
Tonight We Riot
Tower of Time
Treasure Adventure Game
TrickStyle
UltimaTM Underworld I
UltimaTM Underworld Il
Under The Moon
Vertical Drop Heroes HD
Victor Vran
VirtuaVerse
Wanderlust: Transsiberian
Wanderlust: Travel Stories
War Wind
Warhammer 40,000: Chaos Gate
Warhammer 40,000: Rites of War
Warhammer Skulls 2022 - Digital Goodie Pack goodies
Warhammer Skulls 2023 - Free Game + Digitial Goodie Pack
Warhammer Skulls Digital Goodies
Warhammer: Shadow of the Horned Rat
Wasteland 1: The Original Classic
Wasteland 2
Wasteland 2 Director's Cut
Whateverland: Prologue

Nope.

All I hide are demos, prologues and goodie packs.

All the time, one of my favorite pastimes. Hiding games and then trying to find them. Imagine the joy when I randomly stumble upon a game I forgot I had years later.

Let's see what changed in my case since the previous time :) Ten more I see... Tags should still be self-explanatory.

Games hidden: 0
Why? Oh, that's a long story. It begins 13.8 billions years ago...

I never use the hiding feature, not even for boring goodies packs or free demos.

(but nowadays I no longer claim blindly everything that is offered for free, especially not goodies/marketing packs)

Sure, sometimes. For goodies, for games I regret owning, or for the occasional milkshake duck.

With a list that long, one wonders why you got them in the first place ... most of them anyway.

Personally I don't hide anything of my almost 2200 games. Don't see the point ... a library is a library.

But then I don't really browse that library, and have the games listed in a few other places, where I have better control, etc.

I also assign helpful tags, for when I do need to call up an entry or three, if part of the title isn't sufficient.

Yes, I currently have 349 hidden. Mostly demos, some goodie packs, some multiples of games I already have (like Fallout when I already own Fallout Classic, or Witcher 3 original, while I keep the GOTY version on my shelf.) I do this to make it easier to catalogue my backups.

I like to have demos and such in my library for completion list and preservation sake, but don’t necessarily back them up unless they are a unique game, and not just the first level or such of the base game itself. Same goes with goodie packs, some of them are just a collection of goodies that the base games themselves already come with, so while I like to have them in my library, hide them so I can easier track my local backups without being redundant on files.

I put a custom tag on games I probably never intend to play, but hiding them? Nope.
Same with "non-game content". Just a different tag. Games I haven't played yet but intend to play have no tag. Completed games have "completed" tag.

I only hide demos and goodies, but i use tags for 'games not download yet' or 'next to play'.

Gog very rudely added some freebies without asking.

To hell with Beneath a Steel Sky and those Revolution Software bastards.
They know what they did.

Yes, demos, broken games and some freebies.

Understandable.
It's not to "tidy up" the library view.
I hide to exclude them from being backed up by gogrepo.
I started around when my total library grew to 500-600 games and I thought it was ridiculous to store stuff I didn't care about keeping safe. Same reason I don't download Mac versions.

Some are demos. It made perfect sense to get those, but no point in backing them up.
Some are freebies I thought I might like, but after reading the reviews later on realised they weren't really my thing after all. (e.g. Alan Wake)
Other freebies were highly rated games I felt some silly semi-obligation to grab, even though I knew perfectly well I would never play them (Witcher, Oddworld).
The Goodie Bags? No idea why I didn't skip those entirely.

20 hidden items all together, mostly stuff I picked up for free and found I dislike them so much I might as well "throw them out".