I’m a user coming from Firefox Relay, and I want to suggest a big argument to the comparison page in here (What makes SimpleLogin a great Firefox Relay alternative?).
Long story short, I’m a digital nomad and once you signup for Relay in any country, you cannot renew while being on another country - even using VPN.
I got locked out the ability to respond to 250+ aliases, and the answer from the support person was: “Well, you will have to wait until you come back to the US” (I’m living in Brazil atm).
Not only the availability of relay is limited to some countries, but God forbid you are travelling in the moment your subscription needs to be renewed.
I really think this is an huge and important argument in favor of SimpleLogin.