> if you live/sell in a country that respects software copyright/license, then you can sue them or get a cease and desist for using it against your license (say prohibiting commercial derivative or violating your copyright without authorization)

Prohibition of derivative makes your software not open source

But you can use trademark, instead of copyright to prevent someone else to sell copies of your app. Sort of what Red hat does but that doesn't prevent clones with a different name to pop up.