That was a long one and I’m afraid I won’t be going into all of it, but a couple of things: No, I had no idea what was in your deleted previous message - just got lucky. GDPR right to check your personal info and legal limits to how long old info is allowed to be stored by the service provider means you can make GDPR info requests in EU (not all of Europe, like, not in Switzerland [Proton]) and fight back with legal means (in most cases at least), which is not nothing, even if it’s not perfect. Limits the amount of data a bit - like text messages (but remember, SMS messages are like postcards anyway - they are not meant to be secure). Anonymize/de-anonymize is a whole other problem that isn’t even malicious, it’s just veeeery hard to do very right. And balance of trust & power between a subject and government is an age old question that may never be resolved - even if your own would be ok for now, nowadays we can worry about the other governments too.
For mental health, remember and accept that there are limits to what you can control, and take a look at the links on: New Post: The Evolution of Smartphone Security - #2 by JR-Fi - sometimes you just need to go offline for a while.