They are not licensed in a single State in the US. I challenge them to identify a single state where someone can play with Nitro, and not violate their rules. If they can't, they can choose to use this rule against every player when they choose.

This doesn't mean they will steal from you. They reserve that for people that are up a lot. But any book that relies on a "gotcha" rule to selectively steal has much bigger problems going on.