If I were to host my own bet server, and multiclient in the server with an alt
give my alt and I nudges for free, and charge everyone else with nudge prices,
You can multi-client in your own room all you want. It only becomes a problem when you are rigging bets or using it as an unfair advantage(To gain profit). Which doesn't really include playing twice in a row or giving yourself nudges. While that is indeed annoying, it's not illegal. If you are upset with the way a host runs his room then you can leave.