While there's truth in that, I also feel like the way OP phrased it is needlessly, simplistically cynical. For one thing, just because you're in general agreement with a group doesn't necessarily make it an "echo chamber." There can also be groups that do a pretty good job collectively shining critical analysis on the news of the day in order to sort it out properly. That's a real thing, and we can see it happening all around us.

Not just that, but never before has there been this level of disinformation injected in to Western society, primarily by Russia & China. They've become master internet bullshitters, and we're now on the brink of democracy failing because of how many people buy in to their complete nonsense. Now to me-- that's an echo chamber.

Not so much the ones who take the time to have real discussions about what the news of the day means. That part is much harder work IMO, it involves lots more uncertainty and even soul-searching, and overall I think Lemmy and the other place do commendable work, there. Bottom line, it feels pretty insulting to hand-wave away large groups like that as mere "echo chambers," as if they came anywhere close to what's happening in other places.