I think echo chamber is the wring word here so much as humans naturally gravitate into communities and tribes.
In fact, that was the exact appeal of reddit and Lemmy now. People could foster communities and find likeminded people.
Survival by the numbers exceeds the fittest.
One advantage Lemmy has for now is that it isn't under the same corporatisation Reddit fell under.... for now.
America's obsession with its military and, by extension, 'democratizing' countries is very similar to that of Ancient Rome and how it went about 'civilizing' other cultures.
Which is to say, we have yet to find a Caesar to march on Washington.