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Proton
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I do not know where you got these numbers from, however the 40% aren't correnct. The Linux userbase amounts to less than 1%, atleast on the VPN side. I do however think that this number isn't very different accross all the userbase.
https://www.reddit.com/r/IAmA/comments/10y49ln/were_two_excern_scientists_who_created_proton_vpn/j7w8wxx/
That being said, a new Linux VPN client is currently in development and can already be tested out, more information can be found in the support page as well as on a reddit thread. If you do not rely on a kill switch (depending on your threat model), you could already test that out.
https://protonvpn.com/support/linux-prerelease/
https://www.reddit.com/r/ProtonVPN/comments/15a6f7r/updates_for_the_proton_vpn_linux_alpha/
That's interesting. I would think most people willing to pay for Proton would also switch to a more private OS, guess that's just a small minority of us.