I have no idea why people keep telling you that the provider makes all decisions. Maybe they don't know or are just trying to shift blame. Each sportsbook makes the final decision and if someone get sued, the sportsbook will be the defendant, not the provider. What if two sportsbooks use the same provider but have different rules. The odds provider does exactly what the name says, they are odds providers with the addition of being a profiler.
Because it's four different contacts from four different casinos telling me this? Wait, five. Two doesn't even have the issue with this whole provider matter, and I ask under capacity of due diligence and "hi, sorry for being nosy, if I may pick up your brain for a little for a case with neighboring casino..."? They all came to the same answer. Should that be enough or should I mull over the possibility that they somehow communicate with each other behing our back and conspire to mislead us and shift blame? I can ask to two more casinos contacts, just to be sure.... three.