Newspapers are private commercial entities either owned by individuals or by shareholders. They have no mandate to report anything they don't want to but they do have a mandate to make money for their owners.
As much as you like to repeat That there is a widespread bias or even conspiracy I have yet to hear a decisive argument that proves these money making entities are purposely ignoring a sport for nothing more than some editor or owners personal stance against that sport.
Rugby league at the top level in the British isles is played by 11 teams all from one geographical area. It is not a national sport and neither is it of national interest........if it were of national interest with the public clamouring for news, then the owners of the media would be publishing stories about it.
What I have heard a lot of is unfounded conspiracy theories based around a preloaded prejudice against a sport with a far greater national and European reach that is backed up by a national side playing in regular international tournaments.
How is it that a club like harlequins can attract 82,000 fans to a game.......more than a few sl sides manage for an entire season? Is it down to the nasty editor at the express or is it down to more people wanting to be associated with middle class union rather than Castleford v Wakefield in the grim north of England.
Just because YOU think its not fair doesn't mean that the rest if the country have to agree with you........and they dont