These companies are not simply a mirror back at society. People were interested in Rittenhouse because they were told that it was important. They could have elevated one of dozens of shootings by minors last year to media sensation status if they so chose.
The Rittenhouse incident was all over the internet the night it happened. It dominated Facebook, Reddit, and Twitter while armchair detectives scrutinized every leaked cell phone camera angle and posted their hot takes.
The media didn't tell people to get interested in it.
But there certainly isn't some suspicious media blackout on it. You can readily find coverage.