No different than the rules you set at your own front door.
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You are wrong, my friend. I don’t do a FReepathon to get people to help my my monthly mortgage and bills. If people pay to keep this website going, then they should have freedom of speech here. If someone is paying my house note, then they should be able to say what they want to say in “my” house.
Your logic is flawed.
Every one of us provides a good or service to others to make a living. We do not give up our right to set the rules of our own houses when we accept payment from others for that service.
If you run a restaurant or similar establishment, you've got every right to throw out a paying customer, if they break the house rules.