Just because they're biased or "unfair" doesn't mean they aren't independent. And there's a big difference because you can find consensus or inconsistencies between a collection of independent sources.

The same rule applies to learning anything from other people. The other person is probably biased in some ways so you can't 100% rely on them for 100% of your perspective. But you can talk to lots of people and gain a more rounded world view.

It's only a problem if you limit yourself to getting all of your information from one source.