TLDR: Two apps are integrated with Android. WhatsApp is integrated with Android. Facebook wants the integration to stop, so they sue this other apps integrated with Android.

The solution is easy. Facebook should remove the integration from WhatsApp. Problem solved. If you don't want other apps to extend your functionality, you should not integrate with other systems.

The reality is that when a behemoth like Facebook tells you to do something and that they know were you live (probably literally), your company is at risk independently of how crazy the claims are.

Corporations are the new big abusive government. But we can't vote them out.