It's not really a same thing. I can't reach my mother or neighbor over fediverse since they don't know nor care what that is. But they use whatsapp, facebook and other stuff which are in their own walled gardens and there's no option to communicate to those gardens with anything I self host.
And trying to convince everyone to switch is not a battle I'm actively fighting for multiple reasons. Of course I mention signal, fediverse and everything to anyone who's willing to listen, but those encounters are pretty rare.