A while ago we lost the "Price Promise" where disproportionate regional pricing was offset with Wallet funds.

We where told this was removed so GoG can give Devs a better cut.

So how much is GoG taking from devs now?

Not enough.

Silliness(yet serious reply) aside, I don't know, and I don't think they will tell us as GOG seems o not like telling us much about it's inner workings for years now.

As for the end of the FPP: I think they did it for other reasons, like perhaps dev pressure to do so, or to cave to other stores and such who might've been affected by it....this is all speculation, though.