It depends on what the ISP wants to do, right? They could forward the request along, or they could say "whoaaaa we don't want this customer" and turn you off w

It depends on what the ISP wants to do, right? They could forward the request along, or they could say "whoaaaa we don't want this customer" and turn you off with no appeal process. They have an obligation to forward the notice to the end user, but the end user doesn't have the right to have Internet access while the dispute process proceeds. That is a legal program, and it is certainly worth considering whether or not business Internet should be a "right" or not. (And I guess that as the Internet market heats up and competitors become available, a ToS like "we won't turn you off just because you get a DMCA notice" could be quite appealing.)