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So you want to know if the US government has a ban on a part of an industry where there is at best a gray area in regards to legality?
What your question directly relates to is can affiliates give comps. Of the Sites that have forums here, some have automated comps set up specifically to faciliate that for affiliates. Certainly they aren't aware of any law like that.
There is no worldwide law banning comps an affiliate can pay the players. I can say that with a relative degree of certainty.