But most of them are easily replaced if they go bad. Even domains are of course technically rented, but your own domain is among the most stable identifiers we have on the internet - people owning domains over decades is commonplace.

If my domain registrar, my DNS provider, my hosting company, ... go "bad" I can just move and my readers won't notice. Even if you are on hosted wordpress etc, you can archive your site as is and move, preserving the URLs. That's not the case with Medium etc where your content lives under their domain.