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Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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That is exactly the point. The Linux userbase is generally more privacy oriented and thus available on Proton‘s channels, be that Twitter, Reddit or here.
However that doesn‘t mean that in the global numbers of >100m accounts there are that many Linux users. There it is indeed < 1%. Without offense, Linux users are a vocal part but in the big picture a minority.
That doesn‘t mean there won‘t be a Drive Linux client. It just means different priorities in releasing for in advantage for the bigger platforms first.