Satoshi Dice was before my time. But I wonder if Bitcoin wouldn't be happier if we had more onchain gambling. I don't gamble myself, but it strikes me that this is something that Bitcoin can do that is very difficult to do anywhere else (eg. provably fair roulette). I imagine there is a way to do something similar with poker. Why aren't people doing more games like this on bitcoin?

A protocol sketch for a two-party roulette game between a player and a casino. It uses a revocable 2-of-2 payment channel, hash-preimage-length commitments for randomness, Taproot script paths for unilateral dispute resolution, and payout-class settlement transactions for arbitrary roulette betting patterns.

This is a design document, not production-ready consensus-critical code. Every script fragment below is pseudocode and must be compiled, simulated, and tested on regtest before use with real value

What I find really cool about Linus' proposal here is that it keeps the gameplay off chain unless there is a dispute that needs to be resolved. It relies on a channel construction that looks a little like lightning:

Which leads to similar concerns regarding fee selection and pinning:

I didn't fully follow the scripts Linus' is proposing, but at the very least, it could be worth your time to wrestle with it a bit and think through how they work.