Personally, I feel like their service, except for VPN, was always half assed.

• No access to SMTP for automation
• Need to use that shitty bridge to use a useful client
• No pgp encryption in their web interface when talking to people not at proton
• proton drive does not offer any useful protocol like ftp, webdav, or sftp
• Calendar and Contacts cannot be easily synchronized to phone and desktop apps

The list goes on. I have only one account left with a proton email and the letter with a code so I can change that lies on my desk.