Comment by awesomeMilou

This has nothing to do with whether there are perpetual licenses or not.

The way the go about this makes it seem that you enter a contract that you can never reasonably exit out of, as in order for you to stop having to pay, you'd have to convincingly prove that you forced every customer to uninstall your app, i.e. that there isn't at least one install left.

This sounds absolutely bonkers to me.