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Isn't that the same as discord audio channels? I'm also confused about what clubhouse is or why it's popular.

Because people enjoy talking and listening to people talk. Especially when it involves topics they are interested in, or people they are interested in. It is sort of a cross between talk radio and ham radio.

It's like mumble, 1:1

If it is this (I also don't actually know) then it sounds terrible.

Imagine conference call with strangers