People still have to connect to your relay to get your feed. Hosting your own relay will literally never be meaningful competition for broader network relays as a service. For the simple reason that no one wants to run their own server. This has basically been a truism of the internet since forever. We could all just as easily say Google Drive and email will never be a viable service because everyone can run their own cloud storage and email server for relatively cheap. But that clearly doesn’t happen that way.