The US government obviously won't ban apps for cooperating with the US government, that doesn't make sense.
But other governments should ban such apps. The CLOUD Act drafts all American tech companies into the US intelligence gathering apparatus; all American companies providing services to foreigners are legally compelled to be spies. EU laws that require EU data to be stored in the EU? Nullified! The CLOUD Act undercuts any foreign data residency laws by requiring US companies to hand over even that data which is stored in other countries. All US tech companies are required by law to participate in espionage. The EU should respond by banning all American apps in the EU (but won't, for obvious realpolitik reasons.)
But other governments should ban such apps. The CLOUD Act drafts all American tech companies into the US intelligence gathering apparatus; all American companies providing services to foreigners are legally compelled to be spies. EU laws that require EU data to be stored in the EU? Nullified! The CLOUD Act undercuts any foreign data residency laws by requiring US companies to hand over even that data which is stored in other countries. All US tech companies are required by law to participate in espionage. The EU should respond by banning all American apps in the EU (but won't, for obvious realpolitik reasons.)