When it comes to the dissemination of incorrect facts though, no it isn’t a decision purely for the owner of it. It’s bound by laws which also differ in the different markets it operates in.
Regarding an echo chamber, it can be but that’s down to how the individual chooses to consumes content. It at least gives the opportunity to consume a wide range of opinion. You’ll get extremities with that, but if it’s echo chambers that are your concern, then that could be levelled at anyone that’s solely read the same newspaper for thirty years too. It’s a sewer as much as you want to be and how much you want to play in it yourself.
Personally I consume it more for music and it’s a brilliant platform for that. If you’re selective with it and who you follow, then it’s a brilliant way of getting information for any topics you like or persons of interest.