What was once called an ego chamber is now called being with like-minded people.
Every “group” has one.
You are probably in one or two yourself.
Though you may not even realise it.
Except, the thing with echo chambers is that they don’t encourage you to grow, to learn more, to become resilient.
They keep you fixed where you are.
If you aren’t evolving you are effectively dissolving.
And that is what makes echo chambers dangerous