You are correct, every source of media has a bias. To expand upon your comment. Whenever we are consuming media and in particular news that sould always be in our minds. Who's is sponsoring this, what is trying to be accomplished by this piece?
Al Jazeera has a stronger bias than most but considering that it's essentially state media they are a lot more objective than I expect they would be. It's not a trash news source but it definitely takes more scrutiny than say DW news.
Completely subjectively! It's inpart because of how they acquire most of their funding but my own personal bias is the most impactful.