By re-classifying both cable and DSL as Title 1, rather than Title 2, that meant that they were no longer common carriers, and could kick all the competing ISPs off their network. This is why it seemed that most of the third-party providers went away nearly overnight.
[0]: https://www.cnet.com/news/fcc-changes-dsl-classification/
[1]" https://www.nytimes.com/2005/06/28/technology/cable-wins-int...