Depends. What do you think are using most of the people? I would wager something like gmail or outlook. So, even if you pay for an encrypted provider, chances are, 99% of your mail is unencrypted on some untrusted servers.

If I have to communicate securely I use signal.

Purelymail gives me the benefit of beeing super cheap and giving me many options on how to access my mails. Plus I can easily share my domain with my family.