Back in the GTalk days, you could talk to your entire Google contacts list via federated XMPP.
So even back then I had way more contacts on XMPP than GNUSocial or Identica.
Google played a large role in killing off XMPP usage and the day they announced sunsetting GTalk was when I realized they're just another embrace-extend-extinguish monopolist.
Society needs self-hostable, scalable and functional alternatives to surveillance capitalist systems of manipulation and censorship.