I was going to write some long paragraphs with some math proving that CDP makes more money proportionally on Steam due to the sliding cut (20% on sales above $50M USD) compared to GOG.
Just keep in mind that while CDP does see 100% of the sales revenue, they still have to pay out GOG staff and other costs so they effectively make 6% net profit margins at best. With > 20M Steam sales by Leitboxer approximation, Steam is taking close to the 20.2% weighted cut for all historical sales. So that's a 79.8% cut for CDPR.
And let's not forget that EGS is even more friendlier to devpubs and takes 12% after $1M USD in sales, so if CDP needed a redundancy and pump its numbers more than GOG still, they've still got EGS too.
So for example, let's say someone bought CP77 for regular price at $60 USD today on all the stores. What does their net profit look like per copy sold:
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Steam ($19.15 USD net profit) - CDPR takes a 79.8% weighted cut = $47.88 USD revenue and then makes 40% net profit after that = $19.15 USD net profit
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Epic ($21.12 USD net profit) - CDPR takes 88% cut = $52.8 USD revenue and then makes 40% net profit after that = $21.12 net profit
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GOG ($17.88 USD net profit) - CDPR takes 70% cut = $42 USD revenue and then makes 40% net profit after that = $16.8 USD net profit. GOG takes 30% cut = $18 USD revenue and then makes 6% net profit after that = $1.08 USD net profit. Then big daddy CDP adds the two net profits and gets $17.88 USD net profit
So when someone buys on GOG, it's still 7% less net profit than if someone bought it off Steam OR 15.3% less net profit than someone buying it off Epic instead.
Do a qualitative risk analysis here. There is no way Steam isn't going to publish CDPR's next game unless it's illegal because they'd be looking at a lost opportunity of $202M USD in lost revenue. The chances of this happening is so low, it's effectively a moot point.
Even if they "preserve" these old games, there's nothing stopping IP holders from pulling the game after all that work unless this was written in the contract. Remember, these devpub execs don't think like you and me. They probably see old games as competitors to their remasters (e.g., Warcraft 1 and 2 that was recently delisted here). Again, talk about a lot of wasted effort and costs to appease some of the oldest and paradoxically some of the most price-sensitive customer base despite having the most disposable income.
You can do whatever you want with your money and I will do the same with mine. I do not support GOG going down this route and their upper management and whomever suggested and enabled this stupid business model should all be fired and replaced.