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All Proton Drive apps are now open source
(proton.me)
This is a most excellent place for technology news and articles.
https://rclone.org/protondrive/
Sometimes you don't even need the open-sourcing side of things. I use rclone for OneDrive and I doubt Microsoft open sources it.
That being said, the rclone proton drive docs mention it's a beta and it's mostly the API they need to work properly.