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Their calendar, contacts and bridge don’t support CalDAV/CardDAV, so you can’t synchronise them anywhere.
The iOS app doesn’t synchronise contacts or calendars either. There’s a one way “upload to proton”, but not the most helpful.
The public holidays only include some countries (not mine).
Their VPN is terrible with 20% packet loss, despite sitting in the same data center as other VPN providers without that issue.
But, still not google, and their mail app is better on iOS than fastmail.
“Known CSAM” suggests researchers ran it through automated detection tools which the dataset authors could have used.