It does indeed look like the social media landscape is fracturing into separate tribes. Whether this is good, who knows.
One quote from the article is this: “X for the rightwing and the raging; centrists and policy nerds on Bluesky; people who hate politics on Threads or Instagram; Gen Z on TikTok; boomers on Facebook”.
Lemmy is a leftist echo chamber for computer nerds and people who can’t stand reddit anymore.
That’s pretty much it. Lemmy is just reddit lite.