On top of that, people still use email to sign up for these gardens. Technically, you could use your phone number too. I wonder how far could you take this idea of living completely without email.
Job applications, and several other sign ins still depend on email, so that’s going to be a bit of a hitch.
Are you talking to a conspiracy nut? If so, you can forget about reasoning with them. They don’t play this game by the same rules as you do.
No amount of logic, facts or evidence will ever help. They have emotional issues, so you need to use an emotional solution.