Selling get rich quick schemes, workout plans, etc?
It's very difficult to do this in a way that produces sustainable, durable revenue, and I suspect that people doing technical educational content are finding it increasingly difficult in the age of AI.
Trends for his YouTube channel look pretty much like what I expected given the general trends in the marketplace.
https://socialblade.com/youtube/channel/UCJZv4d5rbIKd4QHMPkc...