

Lemmy isn’t social. It’s just forums aggregated. One could use it as a social app, and some people do, but it really is not necessary or even really welcomed.
I have seen estimates of a reduction of 50 to 75 percent in the number of forums over the last 15 years. There are certainly a lot less. People go to reddit or discord these days.
Same with IRC but the decline is even higher.
Go look at the major irc chat hosts. Add up daily users. Then compare that number to the estimated users in 2005-10.