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Proton
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It's not fancy like an automatic folder sync thing, but at least I could mount a Protondrive directory and do my own syncing myself (I'm a Linux nerd afterall). There is no need for "deep filesystem integration" as he claims.
The same thing could be used for Calendar with Caldav feed as well. A single "Bridge" app could me made to handle Mail, Drive, Calendar
That would be my dream.