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Proton say they accept Bitcoin (https://proton.me/support/pay-with-bitcoin)
But the billing window looks different for me than when I open the guide:
Edit: Okay I immediately take it back, Bitcoin is only available in the +12 month option
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Mullvad will probably be better then as you can pay for a month via lightning
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you could try the free version of proton, see if that gets you what you need.
Mullvad and proton both accept bitcoin