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Fax machines are actually still pretty widely used in corporate America (but not in households at all). Especially insurance and medical companies. I remember having to ask my dad years ago to fax something for me from his work (a bank’s corporate office) since we didn’t have one in the house. (I don’t remember what the fax was for.)
I admittedly should’ve done more research before my first comment, but it does actually turn out that everything I said is true. Proton’s technology was previously audited by Mozilla and is currently audited by SEC Consult and other companies regularly, and the audits are available for everyone to view. Additionally, they do have a bug bounty program. Also (and this is something I didn’t mention), the ProtonVPN and Proton Mail apps are all open source.