I went from Google to Proton and then switched out for another provider. No offline mode/IMAP support allowing me to use an email client on my phone was bothersome as I need to monitor multiple inboxes. Email was fine but sluggish (in part due to decryption so partially understandable I guess). Still use the VPN which I think is their most mature product. Drive is basic but I didn't need much more.
I was willing to put up with the annoyances when I really believed in what they were doing. But after the GOP comments, the crypto/AI stuff, and leaving Mastodon it just all became a bit much. I like that they are nonprofit, FOSS, and independently audited of course, but their messaging/priorities have been mixed to say the least. Wouldn't blame someone for staying, wouldn't blame them for leaving at this point.