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In the US this is almost always prohibited by the residential internet terms of service, and can subject you to account cancellation.

Is it really? Which part is prohibited? Isn't that part of what you sign up for when you specify upload speed with your service contract?

I'm in the US and have never not had something or other being served on public facing ports

"servers" are the part that is prohibited per ToS, even if the ports aren't blocked.