“If I let Timmy and Sally each set up lemonade stands on my front yard and then kick Timmy off when I find him pissing in my pool, am I restraining trade?”
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That’s an incredibly silly and desperate grasping at straws, totally divorced from any reality. Try coming up with something that involves two parties where both are making a profit from their interactivity and no crime has been committed (as in the reality discussed here)- if you can. Good luck.
You left out a pretty important element. They're using someone else's private property to make their profit and they're using it at the property owner's pleasure.