They welcomed constant payments, especially the exploitative ones. They loved their cut
They could have restricted the amount you'd buy at once instead of absurd things like $99 options or games that blocked you from playing after every 20 minutes unless you coughed up more dough.
They loved it and couldn't get enough.
It just encouraged developers to track $/user or % paying users and other shitty metrics that if they were not hit they purposely made their game worse to frustrate users
I see your point; however, if they stopped, the people would give them grief for that. But I'm with you. They should take responsibility and help stop exploitative practices.