they didn't buy- TWC spun them off as they still own part of that company.
and BHN does get their service from RR- they use the RR National Help Desk and RR branded email addresses.
here ya go:
»brighthouse.com/corporate/shop/i ··· internet
The left hand side will say ROADRUNNER Internet.
By removing RR from their network would take more time and $$$ than BHN would wish to spend as well. Too far integrated and has been for too long. I'm just suprised that any MSO hasn't gone back to the @home era and just outsource the ISP completely- the same as Sprint did with Earthlink. Takes away total customer related problems - CSRs, Tech, etc. The Customer only deals with the ISP and not the telco provider.