[jesperwe]

Not even https://mullvad.net/en/why-mullvad-vpn? (The only VPN I've heard of that allows you to pay anonymously with cash)

[loteck]

Proton takes cash.

https://proton.me/support/payment-options#cash

[nouryqt]

Just for completions sake, IVPN takes cash too

https://www.ivpn.net/en/pricing/