for betting systems...

doesnt have to involve zaps or even lightning, but ultimately needs a way to track...

for a round...

1) players 1..n provide an entry ticket/credit to coordinator

2) players make decisions, locking into selection while coordinator validates choices to any specific rules

3) an independent thing/oracle that cant be influenced by players or coordinator provides outcome

4) winning player(s) get rewarded, while coordinator gets a small percentage for service

traditionally, coordinator accepts entries, and makes payouts.

the smart contract side is feasible. its the regulatory side around custodial value that becomes a challenge in most jurisdictions