How gambling makes billions without innovation

The innovation in the gambling world is quite definitely there: it's however used against you, so kept quiet.

Slot machines now have variable payout, report fatigue level of their players (frequency of pulls), every single table game played is tracked with player cards, poker chips have RFID in them, etc.

New table games come along every few years. Poker is remarkably unprofitable compared to almost everything else.

There is tons of tech and innovation used in the Gambling industry. You're just it's subject, so you're kept in the dark.