I’m not sure what you mean.

A pyramid scheme uses new investor money to pay fake returns to those who have already invested.

A casino provides games to bet on where expected value for the player is negative. A sportsbook balances their book by modifying the odds to remain as neutral as possible and capture the spread (see ‘vig’).

There’s not a whole lot of similarity there.

Probably referring to online gambling specifically. And I would frame it as the folks who promote pyramid schemes are the same as those who promote online gambling.