Mostly because developers (me included) don't like to be told we are being laid off due to AI that was trained on our free open-source hobby projects.
Hey, this attitude sucks. Would you tell this to someone who got beat up in an alley?
Spend your time making better software you and your friends can use... don't waste the time trying to stop others from making another painfully average codegen machine.
Starve the greedy beast