Getting a domain is no more difficult than selecting some "easy web hosting and email" bundle on a site and paying for it with bank transfer, credit card or whatever. There's an entire industry around this. I've met plenty of people who are largely clueless about PCs, doctors, lawyers, artists, etc who have their own domain. It's actually extremely common, because conducting business from a Gmail account is a bit unprofessional and sketchy, particularly here in Germany.

> The average person is not intelligent enough to have their own domain.

You think that that skill (maintaining own domain for email) is an indicator of intelligence?

I said "own your domain", not "self-host your email server".

Or they have better things to do vs fighting Route53 MX records errors.

Sounds like a business opportunity.