

Anything you pay for will only be as anonymous as the payment method you use, things like bitcoin are not really anonymous since buying bitcoin without know your customer regulations is hard. If your adversary has the resources or your threat model is high enough even paying by mailing cash proposes a risk which is why things like tor need to be free. My advice is get a password manager and create unique long passwords and never reuse usernames to prevent doxxing threats, I use keepassXc for everything even my bank.
Not really i don’t use any services that need it.