joveian: I don't think this is the case on GOG (I have no idea about Steam).
Legally, It applies to any store, when selling ANY declared as unfinished product, the purchaser accepts that product AS SEEN.
The store has NO lrgal obligation to ensure the project is completed, the store may do so to foster good will, but they have no legal obligation.
One would hope GOG being curated would at least, ensure In-Dev games reach the bare minimum of an alpha state
Clearly the pay Valve $100, and sell any old crap Flea market that is Steam, doesn't give refunds after 2 hours played, even if an Early Access title never gets finished, and especially in the zombie/survival genre dead Early Access games, are a meme.
Regardless of GOG's policy, this games a typical example of a publisher using an awful business model.
First by Crowdfunding a game, the publisher's only job, is to fund the development, not get gamers to do it for them.
Adding insult to that injury, they compound their awfulness, by selling the unfinished game, after crowdfunding it.
I'd be OK with that if the dev didn't have a publisher, but if the publisher doesn't have the cash to fund the game, they should stop expecting to take any profit out of that game.
As a gamer, I'm only willing to back a game project without a publisher, but if the publisher want the profit, they can damn well fund the games development, with their own money, not mine.