There are two motivations for running a news outlet, both with extensive historical precedent:
- You want money.
- You want to spread your view of the world, inflicting your culture on other people.
There isn't a lot of immediate financial gain associated with the second approach, but the gains are real enough, long-term, that there tend to be plenty of such outlets receiving subsidies from people who believe in the message.
But in the modern US, while we still have outlets of that type, there is a very strong belief that they shouldn't count as "news", and that they are less legitimate than "neutral" journalism. That reserves moral legitimacy to the money-oriented approach, and that approach is necessarily driven by attention. News that nobody reads can't sell.