content: Several reasons: first to lower the standards the ISPs have to follow and since the technology is consistently improving, also to avoid having to modernize current infrastructure since it's "good enough".  On the other hand you can also reduce the capabilities of simple individuals to offer commercial applications using their home connection; say, proxys, VPNs, hosting, etc. Arguably this can also slowdown the development of highly distributed networks that could revolutionize once again the internet and hit hard some of today's giants. (Government's won't like it too... )