According to CenturyLink, it was shown in error - They misunderstood a new law regarding filtering software. It's a bit bizarre. Why would they think that they needed to go to such great lengths to fulfil the requirement of the new law? Other providers managed it handily less invasive methods.
Read the rest of the article at ArsTechnica.
Just had @CenturyLink block my internet and then inject this page into my browser (dns spoofing I think) to advertise their paid filtering software to me. Clicking OK on the notice then restored my internet... this is NOT okay! pic.twitter.com/NtCZUeJF8I— Rich Snapp (@Snapwich) December 9, 2018