This place is an echo chamber in places like fuck cars and the socialist subs

What aspect of fuckcars do you consider an echo chamber?

There's over a dozen socialism communities, if you find one to be an 'echo chamber' then I'd suggest seeking another. I'd imagine the socialism community on Beehaw would have a completely different vibe to the one on Lemmygrad, as an example

Was banned for what I can tell was pointing out that lemmy instances do not protect privacy at all

This is common knowledge though, wouldn't be surprised if the mods were sick of the same discussion being created over and over again by various users. Something federated - designed to be open, decentralised, unrestricted, cannot be inherently privacy friendly.

If your privacy threat model brings you to an ideological disagreement with federated networks, it would be reasonable to consider moving to an alternative platform IMO.