I don't see the need for extra tooling like DPI when the willingness and methodology to outright block sites at a higher level is already in place. Also bear in mind that the groups who have compiled the most widely implemented block lists are also major sponsors of the bill which this 4chan story refers to, so they have largely gotten what they wanted.
https://en.wikipedia.org/wiki/Web_blocking_in_the_United_Kin...
I don't see the need for extra tooling like DPI when the willingness and methodology to outright block sites at a higher level is already in place. Also bear in mind that the groups who have compiled the most widely implemented block lists are also major sponsors of the bill which this 4chan story refers to, so they have largely gotten what they wanted.