you could say "I use a VPN"..

VPN service: Requires trusting a single provider; not as anonymous as Tor; browser fingerprint differs from Tor’s
VPN paid service: not anonymous if you paid with Fiat XD

I think you’re making some critical errors in this reply. If you make personal privacy or security decisions based on its content, it’s probably a very good idea to reevaluate them with a clear and honest outlook.

It is easier to develop trust of a single provider than to develop trust of a random decentralized network of providers in a system that has been under confirmed attack for at least 15 years.

Browser fingerprinting can be defeated or manipulated in many ways to accomplish different goals outside of either using tor or a vpn.

Cash may not be under active surveillance and provides fantastic anonymity if you are capable of handling it appropriately. Even if you are not, investigating cash transactions is incredibly expensive, cumbersome, time sensitive and is defeated by a million simple methods that have been in practice for millennia.

I don't understand your wording of what that limitation is.

My best guess would be that you mean you want to use a custom domain for the email address..?

So I rephrase, \
it means that if you subscribe to another web service/website ( F*cebook, mastodon ...) whatever and you receive an email to confirm your registration with that service, the email provider will block, freeze, or ban you. \

I hope it's more clear now

Thank you, that makes more sense. Proton has an article on this (proton.me/support/human-verifi…) and it does imply your use of tor will trigger it (as opposed to only requiring captcha).

My only 3 ideas are:

1. Some search results indicate that upgrading to a paid account removes this issue on proton, but it seems the wording for this on the page above was removed. If you're willing to try spending some money on it you can try upgrading the proton account with crypto (buy bitcoin with monero?) and pay for a month?
2. Try if they accept adding a verification email from an anonymous provider, or another provider which would do this?
3. If you plan on/have the option to go on a holiday check which countries allow buying prepaid SIM cards for cash without ID and pick one up to pass the verification on one of these providers?

Human verification | Proton

Learn about the Human Verification methods you can use to create a free Proton Mail account, when they are available, and when they are not

^Proton

Thanks for your 3 propositions 👍

1. so paid, can only be with an anonymous crypto like Monero otherwise it's pointless
2. can you rephrase ?
3. That's an ideas, but one might need to create new e-mail every week :)

On 1, would it not work if you created a new bitcoin wallet, then bought bitcoin with monero and used that bitcoin to pay? I understand BTC isn't anonymous, but if you fund the wallet only with BTC purchased via monero and don't re-use the wallet it shouldn't identify you.

On 2, I meant to test if proton mail (or one of the other providers where the only issue is needing another email address) accepts adding a verification email address to the proton account (which in theory passes the human verification check), where the verification email address is from for example disroot, or from one of the anonymous mail providers. Basically just a test if the human verification check can be circumvented with another provider that would do the human verification check or similar, maybe there is a gap in the validation for one of them.

Does that make sense?

Either way, if you need this to be anonymous and also rotate the account with a high frequency like weekly, probably neither of those will remain feasible even if one of them would maybe work once.

did you use a VPN or Tor? That's usually where they start asking for a phone or secondary email during the sign-up process.

VPN or Tor are necessary if you want to create anonymous accounts.