I opened a free account several years ago and because of good service I later upgraded it as well. For years I had no problems with Proton and my confidence in them remained very high. I only used my account to communicate with our bank and doctors' offices. Proton seemed the best solution to deal with sensitive (financial and medical) information. I didn't even use the Proton account with friends and co-workers. After talking with my wife, she also wanted an account. So, I paid for her account last month. In addition to that account, we are starting a new business to help homeless vets and others and decided to use Proton to host our business accounts. A lot of time, energy, and money went into having Proton host our business accounts. Within a few days of establishing the new accounts, no new emails were showing up. I sent a query to Proton support asking why we weren't receiving emails. After a number of email exchanges, they said my accounts (all of them) were permanently disabled. There was no warning. There was no notification of a pending shutdown. Most importantly, when asked why the accounts were disabled, the reply was it is "due to a series of violations done against out terms of service. We cannot allow our service to be used for malicious activities." I can say unequivocally that we have not used those accounts for any malicious activities. We very much support their policy and did not violate it. When asked to clarify what the activities were (we don't care who reported it), all we received was the canned, generic, very unhelpful quote above. Since I know we did not violate their terms of service, it makes me wonder about their true intent. Was it socially, politically, religiously, or even racially motivated? We don't know and Proton is either unwilling or afraid or both to give us any details. Even when the police pull someone over, they don't say the law was broken, give you a ticket, and leave. They tell you why. I cannot offer any kind of defense to show their evidence is wrong. Now our accounts (and the email history), money, and the email lifeline for our business are gone. I regret giving them our business and strongly recommend others avoid them.