They aren’t URLs they are URI schemas. A URL is a segment of the URI schema.
Comment on Why does Lemmy use "@" instead of ":" like Matrix does?
NickwithaC@lemmy.world 2 days ago
Better question is why don’t both use a dot like URLs do because people have had 30 years of getting used to that:
username.lemmy.world
Plus this wouldn’t get confused with an email address.
deur@feddit.nl 2 days ago
RagingHungryPanda@lemm.ee 2 days ago
That’s technically a subdomain and the same reason email went with @