I'd be interested to see the political pressure it would create. I think the network is strong enough that people won't switch to other apps instantly and there would be a pretty big "just gimme back my WA" outcry which politicians would probably need to respond to.
Obviously the Datenschutzbeauftragte are theoretically independent but I'm sure they'd feel the heat. At least I'd be interested in seeing this play out if a law is being discussed. It won't ever happen but I have a feeling people would want WA enough that it could theoretically be used as a strategy.
Indeed being German I can say this is true for Germany because of the experiences with two dictatorships on German ground in the 20th century - the last one ending only about 26 years ago. Many people living in the GDR that were under supervision by the Stasi (often without knowing) have read the Stasi file (if it exists) and know what details have been recorded about their lifes and what kind of kompromat could in principle be derived from it.
I trust my government with my data (well, mostly) because if it abuses that trust, I know that I and my fellow citizens can vote it out of power. We have no such control over FB.
The government is not asking you if you are a member of a religious community that has not choosen to use that service.
Afaik you can enter whatever you want on the tax form, it is just used to collect membership fees/church tax on behalf of a church. Mostly part of an old deal between the state and the catholic church.
Scientology on the other hand counts more or less as an enemy of the state, stability and not something you let near children. So you need to fill out a corresponding form for specific jobs. If even half the stories of what they get up to are true that is a good thing.
If you're not in the USA or Canada, and use Facebook, your agreement is with Facebook Ireland Ltd, and bound by Irish, and European, data protection law.
A Facebook user in India has EU data protection rights.
Here's a report from the EU commission about why the US constitutional/legal protection is much less than the EU (and hence German) equivalent:
http://www.europarl.europa.eu/RegData/etudes/STUD/2015/519215/IPOL_STU%282015%29519215_EN.pdf
Basically: Unlike the EU Charter of Fundamental Rights, US 4th Amendment doesn't cover non-US people outside the US, and it only covers government warrents. What Facebook does with your data is not covered by the 4th Amendment. What Facebook does with your data is covered by Article 8 of the EUCFR.* chats not end-to-end encrypted by default (only secure chats), so clear text is on their servers
* group chats can't be secure chats
* the crypto is somewhat unconventional. While the developers had their reasons (constraints of mobile platforms), and no exploit has been found so far, AFAIK, any self-rolled crypto is a bit of a red flag to cryptographers.
* I have no reason to distrust Pavel Durov or his motives, but I am somewhat skeptical of services based in Russia (also, just to be clear, of services based in the USA or other five eyes).
To me, Wire might be the best of both worlds (as I've said in another post in this thread, and BTW I am not connected to them in any way):
Signal protocol; based in Switzerland; smartphone, desktop and web client; free; text and voice chat and group chat; open source (GPLv3, and on github); signup with phone number or email.
the desktop client was not encrypted at all last i checked, only the mobile client.
signal is e2e encrypted, it's in a completely different ballpark