content: DDOS protects large ISPs that partner with certain hosts to ensure mitigation isn't feasible for competitors.  It only takes a SYN flood of 100m to cripple most sites.  Its the 1-10g attacks that effect hosts and providers because they have to nullroute the IP. Most smaller ISPs have to add filters to prevent customers from creating attacks but larger ISP's have little to no filters because not only does it effect their competitors more than themselves but because even if it did effect them it's such a small portion of their subscribers that they likely have more new activations that day than cancellations.      This is where net neutrality should be rewritten.  Right now it prevents them from only discarding the traffic their investors want meddled with which is torrents and vpn, not actual malicious traffic.  If they added malicious traffic mitigation and preventive measures to the bill it would risk their ability to damage other networks and open up competition.