The stupidest example of this was Bryce Paradis back in 2006/7/8. He was crushing nosebleed fixed limit holdem, which capped at 1k/2k back then, and made 3million USD IIRC.
He then decided it would be a good idea to give away all of his secrets to success (mainly math that wasn't well known) on a training site that he had part ownership in. I couldn't fathom how one would give away information worth literally
thousands of dollars an hour for $30 a month in subscription fees.
The model made absolutely no business sense to me then, and still doesn't now.
It had the effect of making high stakes FLHE incredibly more difficult and saturated. I used to sit alone at 150/300 and 200/400 on multiple sites all day and wait for action. After a couple years of those videos proliferating, there were 2 dozen other guys with me on every site (or more). I estimate that his dissemination of FLHE information to the masses added years to my retirement age and helped to lower the life expectancy of online FLHE games, which, believe it or not, still thrived back in those years.
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Kahn