These are all problems that are yours, not mine, unless you've put it in a contract. I don't give a poop about your multiplexing oversubscription. That's a business choice. The bet didn't work out. Data caps are a common way to fix it, but those in the contract. Notice at no point did CL ever say you can't run a Tor exit node. Of course, a common clause in these types of contracts is that the provider can just drop you at their leisure. That's also an option. But don't implement this hacky nonsense. My actual day job is writing bandwidth/packet rate/connection count limiters, so I'm well aware of how these things work.

Even regardless of the Tor issues, the problem OP is having is related to the quantity of TCP connections, not Tor itself. So the points are irrelevant. He could be connecting to arbitrary HTTP servers and run into the same problem.