I mean, every community is an echo chamber, that is what online communities do and have done since the beginning of the internet. Hell, in-person meeting groups are echo chambers more often than not. If you go to an open source convention, the people there will probably echo your opinions on the topic.
Lemmy is definitely an echo chamber in many different communities, I would venture to say most. If someone thinks left communities aren't as much of an echo chamber as liberal or conservative, then they either haven't spent enough time there or are lying to themselves just like the people that say "propaganda won't work on me"
People gravitate towards people with the same views who confirm their worldview. Even if you discuss topics and have different views, you are still in a group with like 90% the same views. That is just how humans are unless one makes a conscious effort to go into hugely different groups like specific debate groups or something.
Lol nope, i don't use bluesky. I agree that corporate manipulative media can go fuck themselves.
I was just correcting your implication for other viewers that the fediverse is any different as far as echo chambers. It is just not a corporate controlled echo chamber.