Another once great channel (the loam ranger) did a deep dive into the phenomenon of why mountain bike youtubers were struggling with the old format.

Its nuanced, part safety, partly that its a tonne of work to produce good content when you can simply switch to fluff pieces like Berm Peak

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

"The Algorithm" doesn't reward hard work, imho part of the math is our short attention spans... there's only so many time you can watch someone else vlog from a sprinter in Squamish.