It doesn't need to be a secret. If you have a megaphone that everyone hears all the time, you will simply have more influence than people who whisper quietly.

6 companies dominate the media [1] which together make up at least 90% of all media [2]. Note that this isn't limited to just news.

[1] https://www.fool.com/investing/stock-market/market-sectors/c...

[2] https://tacomacc.libguides.com/c.php?g=599051&p=4586162

Also, you might find this video either amusing or alarming

https://www.youtube.com/watch?v=_fHfgU8oMSo