Yes I have had many problem with proton mail lately, and yes, I received the same notification from them.
ALSO, I have had long delay problems sending and receiving email from the first day I began using them.
THEREFORE, I have stopped using proton mail.
Someone please tell me if I am wrong (and this was told to me by someone who considers himself an expert) -
1. Both parties have to use proton mail or the encryption does not work. If a client sends me mail from yahoo and I reply to him with proton mail, my email can still be read by a hacker on the clients end. Therefore it's useless to use it.
2. As long as we don't talk about what we will do sexually or sex for money, then LE really can't do anything with it. And remember they can still get info from the non proton user side.
3. Gmail is also encrypted, so if LE wants to see your email they have to get a court order. If they are getting a court order just for you then that means you are already a target and have a serious problem anyway.
4. Another reason sex workers wanted to change to proton right away is because they were worried gmail would cancel their accounts. Well they haven't (to my knowledge), and if they did, so just be ready to change then. It takes 2 minutes.
So I still have my proton mail account, but will only use it if and when I have to.
I have an open mind and still learning what to do, so if I am seriously wrong someone please tell me why. We all need to learn.
Stay safe everyone!