Privacy and encryption are inalienable human rights, even in authoritarian hells like North Korea. There's is no reason to comply with bs laws.
If you don't see mocking a fascist government as a form of protest, I'm not so sure how I can help you see the harm in leaving.
That last paragraph is the problem, they know they are a line of defense for many vulnerable people in France. So leaving them to their own devices is a form of complicit acceptance.
You get sued no matter what authoritarian country your tools get used in, it doesn't mean Signal Technology Foundation has to comply with French law, as they are not beholden by their jurisdiction. That is why I used North Korea as an e.g.: Kim Jong Un can't sue the world.