Rather than reigning in financial speculation and gambling our institutions seem to have resolved the contradiction by reclassifying gambling as a legitimate "market".
[0] https://www.chron.com/culture/article/mattress-mack-super-bo...
Market works well on non-correlated risky affairs with a positive expectation (i. e. Age of Discovery marine trade, where it all started). It can't do anything about a fundamentally negative-sum game.