Sure, but we as the ISP were free to shape traffic, establish arbitrary fee structures, and charge for specific uses of the Internet despite the fact that we made use of Title II regulated phone company PRIs.
I'm not saying that Title II didn't exist in the 1990s. It just didn't govern ISPs.
In addition, back in the dial-up days, how did your customers connect to those modems? Through their Title II regulated POTS service.