You don’t have to agree that it should be against the rules.
You don’t have to agree with the magnitude of the punishment.
You only need to know what the consequences are.
Let’s say my company had a ridiculous rule that if you wear purple socks, you get terminated. I’d argue there are bigger things to worry about) but if the place paying me said that, I would either 1) never wear purple, or 2) quit.
So unless they want to go be the next He Hate Me, STOP GAMBLING ON FOOTBALL YOU MORONS.