It's increasingly the case that internet, tv and telephone services are provided by a single company over a single set of infrastructure. Because those service providers have a vested interest to protect the commercial viability of their own offerings (specifically, the TV and telephone packages), there is an incentive to limit the internet service's viability as a replacement for TV and telephone services. Such limitations allow ISPs to engage in text-book antic-competitive behaviour by directly hindering their competitors, and, arguably, the "specialised services" language would allow them to do just that by treating competitors as a specialised service, and differentiating the service conditions (e.g. by throttling the bandwidth offered).

Additionally, using the specialised service language, services like, say, Youtube, Facebook, Netflix or iTunes can pay ISPs to be treated as a a specialised service, offering a better-than-standard experience (lifted traffic limits, increased bandwidth). Such a treatment is sure to be pretty damn expensive, and raises a very tall hurdle that new entrants in those markets must jump if they want to compete with the incumbents on even ground. This is, once again, highly anti-competitive.

Yes, but if you make long distance calls using VoIP, and aren't paying premium rate, then they want to block those calls. Forcing you to make traditional calls which are of course lot more expensive. That is exactly what this is about.