OP got banned from the US news community because they made some pretty controversial statements and (from their personal PoV) questioned if MAGA cult followers exist. That's the only community on LW they got banned from, cited as being for "rage baiting / trolling", which yeah it very well could be, even with a benefit of doubt.

But that's hardly an echo chamber. It's just one community, and moderators are typically completely unaffiliated with the server and can pick and enforce their own rules, nothing stops them from making or joining another US news comm. They even boasted that blocking that comm made their feed better, so it's not like they wanted to be there either.