You'll be surprised how many people think they can just use [email protected] and have email magically appear in their account. And even more people have no idea what the @gmail.com/@ibm.com is about. All they know is that some of their emails don't reach their contacts, probably because "the computer broke again".
It's not a hard concept, but it's a concept that was only ever explained in school to a sliver of the population actually using email every day.
Plus, federation makes validating accounts real hard. Looking for a semi-popular Twitter user on Mastodon will bring forth 800 Twitter-to-Mastodon-bridges with plausible-looking domains, only for the real user to end up using something like "hachyderm" as their domain name. I don't know any good solutions to this problem, but that doesn't make the problem go away.
It's not a hard concept, but it's a concept that was only ever explained in school to a sliver of the population actually using email every day.
Plus, federation makes validating accounts real hard. Looking for a semi-popular Twitter user on Mastodon will bring forth 800 Twitter-to-Mastodon-bridges with plausible-looking domains, only for the real user to end up using something like "hachyderm" as their domain name. I don't know any good solutions to this problem, but that doesn't make the problem go away.