I read it somewhere awhile ago. You’re killing me asking for a source, goddamn.

EDIT: somewhat ironically, here’s a Reddit thread where a developer says they are a part of the affiliate program, so, I don’t know much funding that brings in. It sounds like a less formal arrangement than I was imagining:

Gog funds Heroic.

I actually think it’s a fairly decent compromise (although I prefer Lutris), since Gog is clearly not interested in paying to maintain a Linux port.

EDIT: Wrong(ish)! See below.