All commercial press is biased to the people that pay them the most its as simple as having to attract the big payers and you know they are not going to upset their biggest customers so yes it is absolutely biased in my opinion.
The ABC on the other hand pays no allegiance to any corporate or commercial entity.
If you follow the ICAC hearings you will see how corporate and business influence politicians and governments. The commercial press is no different in my opinion.
