Most have given up because they just came to try "running a relay", not "to host my own content for me and my friends". They weren't creators, they were devs. And for creators, tools for relay management and access policies aren't there yet. 

Running a public relay is hard - spam, costs, etc - I know what it's like with our big one. Running a personal relay that has strict access policies has no such costs. We run two specialized relays that have zero ongoing costs or scaling issues, just 1% CPU of a server we're paying for anyways.