I'm with you, but they've got a very generous 30 day refund policy, no matter how many hours played, if it doesn't work. So far, I've only had to use it once, on Phantom Fury, which is Verified on Steam but had issues in the tutorial through GOG; some day I'll pick up the Steam version and see if it does any better. I also buy my GOG games through Heroic launcher, which has a referral link so that some of the revenue of my sale goes toward the development of Heroic. That way GOG knows that if they want all of the revenue from my sale, it's clear what they have to do to earn it.

And as a reminder, there are Linux native games on GOG. I just played Duck Detective: The Secret Salami on the native Linux version from GOG.