I have a free account that I made years ago, but I haven't used it for anything.
Btw, most emails are not end to end encrypted on proton. Only emails from/to other proton users or emails sent/received using their "password-protected emails" feature and of course any emails sent/received from anyone that's using openPGP.
Also the free tier only includes 500 MB of storage which is extremely little, it also doesn't include IMAP support which is a deal breaker, it also injects ads into your sent emails which is stupid.
I will try it for a short time and see.
For me to keep using it (and pay, because the free tier is pretty bad) it really needs to be better and not just in the privacy sense. I also need more money.