If non-fiction book market = self help, business help, advice. Good riddance?

I might be wrong but I feel like most of that stuff is the same as YouTube, TikTok. Random person with no qualifications realizes they can maybe make some money by writing about their own random opinions on how things are with no actual data, just feels.

Someone else mentioned history but AFAICT, at least in the YouTube realm, lots of "history" channels are people with alternative hot take ideas about history portrayed as history experts, because it's what gets views. I'm only guessing that same basic fact, controversial ideas get sales, means similar things happen with books. Especially with it being easier than ever to publish.