the equivalency is both go bankrupt if people win as much as the house wants you to think they win

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.

scammin the rubes

not really