Making self-hosting really accessible isn't that easy, even if it's easy to setup the server machine itself. One needs to make their server machine accessible to everyone, which isn't generally possible due to how networks work, one needs a white IP address and making sure no incoming connections are rejected by the internet provider. Also one needs a domain. Obtaining it requires some bureaucratic burden, costs money and pricing isn't always transparent.

These barriers are high enough, so that common people can't create/host their own sites. Only skilled enthusiasts or professionals can afford having their own site.