To be honest, when people start talking about "echo chambers" it's usually because they are upset that I won't listen to bigoted alt-right hate.
For me this term has gained a really negative connotation. I understand the problem but hearing the same tired ranty talking points repeated is not helping my state of mind. If that means I am in an "echo chamber", so be it. Alternative viewpoints, fine, when there is something to build on. But there are limits. When differences in opinion are too extreme debating them is only causing agitation and polarisation, in my experience.
I understand the point but I wouldn't use the term "echo chamber" anymore.
I like this service by the way. I've been thinking of making something myself by using an AI to filter news feeds by the topics I'd be interested in. Edit: Just found out it is very configurable, that's great! My original point was that the default is very US centric in its news choice but this can be simply modified.