LB RE "The Book" by Hungry Minds: They're buying YouTube sponsorships, and just like past grifts such as Established Titles, "As Seen On YouTube" ought to be regarded not as a positive endorsement, but as a warning.
They burn most people only once, but their warnings spread slower than the grifts, so they always find new marks.
Everyone learns at least one hard lesson the hard way. I'm no exception.