Once you get into Ty Coyen's list, you start receiving promos for various kinds of Kindle courses from him (this guy has maybe like ten 97usd Kindle courses to sell to you).
In fact, I received over 10 emails from him on 06/07/2022, got pissed and reported him for spamming and unsubscribed (just Google "Ty Cohen Spam").
Then I checked Amazon for books he's published there, the books aren't even performing well.
Something tells me the money he makes is from the courses he sells and not from published books.