GOG Galaxies Ghost Wrapper might allow for singleplayer video games with microtransactions to be sold on gog.com without microtransactions being in the video games and with out the video game development companies and the video game publishing companies wasting their money on doing this themselves.

According to SPCM it reads like it.

Here you go from SPCM.

www.gog.com/forum/general/games_that_are_unofficially_confirmed_for_release_in_the_future_part_2/post11171

Here is what SPCM said.

GOG has gotten very good at hiding upcoming releases, though I haven't given up. :) Probably the most interesting development was this one mentioned by the scene group PLAZA about how Galaxy is integrated for the recent Mankind Divided release on GOG:
"Square Enix/eidos gave GOG the unprotected binary but they left all the Steam stuff intact, probably because Square Enix didn't want to waste any of that sweet MTX money on dev work. So GOG had to add a platform bridge called Ghost to the game. It's a wrapper that translates the Steam calls and redirects them to GOG Galaxy so the DLC gets unlocked."
Since Warner Bros, 2K, Bethesda, and now Square Enix have been releasing stuff recently, I think it's safe to say that any single-player focused games from these companies are likely to appear, thanks to GOG's Ghost wrapper. I would count on the likes of Mad Max, Shadow of Mordor, Sleeping Dogs, Just Cause series, and recent Tomb Raider titles showing up here down the line.
It's games with significant modding functionality, or multi-player features and content like Borderlands or modern Mortal Kombat that are unlikely to appear for the time being. Unless GOG manages to come up with another solution regarding multi-player and modding, we'll be missing out on those or seeing cut versions here. I suspect GOG is working on something, and that maybe would explain the delay for Civ V?

Sadly as mentioned previously, the way GOG has implemented "leaving Steam stuff in and then adding another middle-ware layer to intercept it", is causing startup performance issues in several AAA games with the way it's currently implemented. Personally, I'd rather see GOG fix this first for the games already here before encouraging more psuedo-hacked Steam versions with the same issues, as "that game you spent a premium on GOG for a DRM-Free version starts up to 5x slower than both the DRM'd & "scene" releases due to iffy middleware workarounds" isn't why I pay a premium and / or wait several years delay for GOG offline installers versions here (that seems to be related to this very same "galaxy.dll -> common.dll -> steam_api.dll" 'wrapper' issue...)

As for "would you buy GOG versions of games that formerly came with MT's if they had them removed?", I think that depends on the game and how it's been affected. Eg, adding pay2degrind / pay2levelup, etc, MT's in a game naturally go hand in hand with the urge to make the base game mechanics more artificially grindy (vs had the game been designed without them) to 'encourage' the 'optional' purchase of pay2levelup MT's. Take those MT's away, and levelling up in the game may still feel unnaturally grindy (because it was designed around those MT's whether they are still there or not) and it's clear that devs won't go back and change core gameplay just for a GOG release, so for stuff like this there may be more to it than just whether cheap wrapper hacks technically work or not.

Finally, I can only speak for myself but post 2015 AAA's that come laden with this "post-purchase monetization" stuff have a certain "feel" about them not dissimilar to how you can feel your IQ drop 20 points when browsing certain "freemium" mobile games on Google Play store that really doesn't resonate with me at all, and I would rather give money to the many smaller Indie devs who don't have the 'attitude' required to shove this stuff in-game in the first place or from publishers whose senior staff don't give speeches about milking everyone $200 for decidedly average games...

I am 100% sure the gog.com employees will fix these problems in the coming months or maybe one year to two years, we do have the corona virus COVID-10 pandemic going on which is taking a hit on a lot of people all over the world right now so just need to wait for the pandemic to be over.

I will not give up on gog.com just yet.

I am 100% sure the gog.com employees will fix these performance issues.

Yes, but it’s not just the last month or two, it’s the year or two, long before covid. Not to mention they managed to get a full new version of galaxy pushed out in this difficult time. And yet, not a word on any of the issues other than lies galaxy”.

The wrapper/dll replacement is nothing anything new, they have been using similar technique for quite a while now for a lot of Steam games. The only real difference was that for Deus Ex they used it also to activate the DLC and they mess it up in a way that required Galaxy to be running.

Having devs provide a "clean" Steam-less build is already already hard enough, so having the same Devs not only provide a clean version but also at the same time re-implement the achievements & co functionalities using Galaxy API is even less likely to happen. So having a solution to takes a Steam build, makes it DRM-free while at the same time make it works with Galaxy definitely makes sense.

Wish I had your faith in GOG.