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If you want to get in to private trackers at some point, Mullvad isn’t an option because they don’t support port forwarding. Just a PSA because Mullvad does monthly payments, so you’ll be able to switch anytime.
Proton VPN and AirVPN do support port forwarding.
Given it seems to be a single guy doing his thing I don’t expect them to get bought out.
It’s a great service and incredibly cheap. With advanced pricing I’m only paying ~0,40€ per month. My domain + purelymail is less than I’d pay for other providers email only.
Edit: If Amazon increases their prices they’ll have to pass it on, but those should be pretty consistent. If you use your own domain (or an alias service) switching email providers is simple anyway.