Knowing that offline installers are mine to keep forever; that is, on GOG, you buy it, you own it.

Proton is nice and available to everyone: https://github.com/ValveSoftware/Proton also those that do not use Steam.

That multi-player thing is kind of nice.

The drm free makes several things so much easier, including getting the games to work in Wine/Proton and playing my games in any country I happen to be in without some drm wondering if I have moved.

All of those Steam features you list are nice, but they're services offered very much on Valve's terms. Not real freedom, to me at least.

The freedom GOG offers is the freedom to run the games how I choose.

Fuck Steam, and that's it. No need no explanation for that.

That's easy, it's "play as long as THEY allow me to play" vs. "play as long as I want to play". Only DRM-free is the real freedom.

"Proton to bring Windows-only games to Linux, " - wine for instance? I am not actually a linux user as such but even I know steam aren't going to be a hero on that platform once they have their claws in. I mean, just look at how they take a free linux platform and then budle it with their proprietary client to ensure they have you trapped in for data mining, monopoly etc.
https://store.steampowered.com/steamos/


"Remote Play to play PC games on TVs and mobile devices" - mmm, should I play in a slouched back breaking sofa position playing my game on a substandard lower resolution monitor, whilst trying to balance keyboard and mouse on my knee whilst getting RSI. Nope, think I will sit at my hugely powerful desktop running ultrawide 3440*1440 at 100 fps+

"Remote Play Together with only the host required to own the game to play local multiplayer with friends remotely and cross-platform, " - I never play multiplayer so can't comment on this but does this not depend on the game specifically. If a game can be played LAN then why bother with all that.

"the rumored Steam Cloud Gaming to play on low-end machines. " - yay, more streaming!! Thankfully the net is 100% fully on all the time guarenteed with no dropouts, lags etc. and steam will never switch off my access to it. Personally I think this is a knee jerk reaction to stadia and will likely fail.

So to summarise:
"steams play anywhere" - so long as you are allowed to by steam, have full fast internet connectivity, and don't mind them auto patch breaking your software, then its probably a great idea.
"gogs drm free" - its mine, brought, downloaded using any old browser, saved on my offline backups, fully playable any time, fully under my control.

As always, rent or buy.

The one that doesn't have a remote-killswitch or compulsory client attached?...

Steam is like a rope around your neck meaning you're free until you are not and find yourself in a position you can not win whatever you do. atleast here you can backup all the games you have bought.

I genuinely don't understand why people would want to play computer games on a mobile device. I have a perfectly good PC with more processing power, a much bigger screen and a better control system; why would I want to play my games anywhere else? If I want to play on my phone or tablet, I'll buy games specifically designed for that platform.

Steam's "play anywhere" (as long as there's an internet connection to install in the first place and thats if you can still logiin) & GOG's "drm-free" no internet required as soon as you download the installers and nothing to stop you moding or altering your games in any way. Anyone who thinks towards the future is gonna go with GOG its just common sense.

Steam, could give away a free game every hour, every day until the end of 2050 and I wouldn't care less.

There is no vs in this case. You can use gog games on steam Remote play by adding the games as a not-steam game. I just played Fallout new vegas and Oblivion with steam remote play, both are gog version of the game.
It's an awesome mirroring that also works on different networks (so you can use it on the go with 4g if your pc at home is connected and it's running steam).
I like this idea, you don't need to buy games on steam or buy steaming only games with drm (like on google stadia) and you can actually play anywhere anything.

There is also the option to use touchscreen overlay instead of a regular controller (maybe also a bluetooth mouse and keyboard... I'm still not sure about that) and that's great (not only to try it, but also to play some pc games that only need mouse).

And for people who don't understand why play games on smartphone... well I work all day long and I can only play with my pc on weekend... but I got many hours during the day where I can actually play (for example on the bus). When I'm playing an RPG is a good thing to be able to play everywhere.
When I can of course I also like to play on my PC, but when I'm outside I like to be able to play good games (not really a common thing on smartphone).

Steam is better. Fuck GOG.

Steam, Microsoft, Sony, Nvidia, Shadow, Google, Amazon

Streaming's a wave that's going to pretty much annul the DRM debate in the long run as more and more control will move entirely towards the streaming party, and it's being invested in bigtime at the moment.