Exactly this.

Ten years ago, you could already code one tower defense or "farming simulator" or bejeweled-alike game, and then reskin it 6 different ways for cheap and release the "new versions". The only new thing is the quantity of slop, but slop games certainly existed before AI.

So long as user reviews are adequately filtered to be real players, some slight tweaks to the Steam search algorithm should do a good job at handling it.

No one will notice or care if Claude wrote boilerplate code for your game. Everyone will notice if you vibecoded the mechanics whole cloth. The people who don't want to play sloppy games, already are avoiding sloppy games just fine.