A lot of people worry that commercial networks joining the fediverse will inevitably take over the network, "like Gmail took over email."
Except, y'know, Gmail hasn't taken over email.
There are 4.5B active email users (Radicati), 1.5B Gmail users (CNBC). About 1/3.
Maybe all the people you know use Gmail.
Maybe that says more about the people you know than about the state of the email network.
Email remains robust, decentralized and diverse in 2023.