I thought GOG Galaxy 2.0 has been stable version, but for some reason I keep seeing BETA in its interface. I haven't downloaded any beta version, I've downloaded it from GOG store directly and I don't have experimental features enabled in GOG Galaxy. I don't have any particular issues, but I would prefer it just be the regular stable version.

I did participate in early BETA ages ago, but I don't think that should still somehow affect it. Or does it?

The beta is all there is, as you can see from the gogalaxy.com site. Maybe they're trying to break some kind of record and outdo Gmail.

basically because Fuckpunk didn't sell a zillon copies and Gog funding got cut to pay refunds/ court fines

Project red is still trading [hell on paper they made money] but its hard to judge how big a hit Fuckpunk did to their bottom line when the accounts look like a deck of cards being franticlly shuffled