Every company in the world will comply with local laws. What you can do its use Tor to access it so your IP address its safe. Send emails only inside the Proton Network so its end to end encrypted. Use a strong and a Yubikey to access it. But even with all of this if you are doing something highly illegal they will catch you. So understand this there no service in the world that will protect you.
Yes I am worried about that too , but what we can do about it? The more I think about this the less I feel the power to do something against surveillance and what it get into my nerve the most is that the big majority of people just dont care that every day we are losing privacy and our freedom. Just look at the UK trying to pass a bill to have backdoor on encrypted communications.
Yes you are right. But as Michael Bazell said just expect that everything you said its going to be leak.