>So, actually, Proton COULD read your email (IFF you use webmail).
The authorities can also read your self-hosted email if they had a warrant to search your house. Even if you enable FDE they can do a cold boot attack.
Just out of curiosity, what is a cold boot attack?
I believe that you would not expect that level of interaction with LEAs for a "stop cop city" dude that hasn't even been charged with a crime.
I'd count that up as a hypothetical win of the self-hosted main in your own location.
If you are Dr. Evil, OTOH, other calculi apply.