It also applies to desktop software. This problem has been known since the good old shareware days.

Sending an DMCA complaint to Apple/Google has at least the potential to be successful. Trying to take down a web site in Russia or China that is selling your software is another story.

Nope, the worst nightmare is being kicked off the store, so you can no longer make any money. Rit has happened to me before, for submitting too many apps.