I was paying $7/m for their mail, VPN and drive services. One of my major reasons to switch was their lack of linux support. They claim that it is hard to find Linux developers. Second reason was their drive's download and upload speeds were terrible, from where I am sitting. Their VPN service is great. I always got great speeds, but their linux apps have always been terrible. Their mail service is also great, but I would like more control over it, like Mailbox.org. on Mailbox, I can encrypt my inbox using a different key, while also having the SMTP submission feature. I really ned that to integrate emails with my websites and services. Mailbox can also encrypt their cloud drive with our key, while also providing WebDAV support (how cool is that). Their mail app on android is open-source but is not available on f-droid. And the apk they provide on their website neither has a notification functionality, nor does it auto-update. Another reason was that I was limited to 3 custom domains, unless I buy their business plan. Mailbox has no such limit.

One final reason was that I did not want to keep all my apples in one basket. So, for mail, I am using mailbox, for storage, I am using a personal nextcloud and a Hetzner managed nextcloud, for VPN, I started using mullvad, but their speeds are terrible and connections are unreliable. For passwords I am using self-hosted vaultwarden.

There are a few more reasons that I do not remember, now. Proton is great, I still trust them. But these small things really go a long way.