the ability to make "worthless trash games" is the only reason that the indie industry can exist at all. there are huge communities around sharing small lower-effort projects (which countless well-received games started out as) and gatekeeping an engine to enterprise customers only would be a far far worse decision than what they've already done
besides, the rates only kick in after your profit reaches 200k so it wouldn't do anything
besides, the rates only kick in after your profit reaches 200k so it wouldn't do anything