well if you go to https://social.beaware.live/@BeAware
That's me. On my own site, all by myself. Yet, I am able to talk to you on Nostr via the Momostr.pink bridge AND I can talk to others on the 25,000+ Fediverse "sites".
Basically the point for me, is to be able to promote myself on my own site, but still be able to talk to others on other sites, without someone else being in control of who I can or cannot talk to. I am in control of me.