As for the cable company there are worse user experiences and always will be by design. Even the latest DOCSIS standards won't help if the ISP is over-subscribed in the neighborhood and/or at their edge or if they have fired or lost all their good network engineers. It will be an endless battle with their users. XFinity formerly Comcast formerly Excite@home formerly a few other names have gone through similar growing pains.
If all else fails one may have the option move to a neighborhood that has fiber vaults and hopefully a decent price on trenching it to the house or already has it preinstalled to the house. Even fiber providers will keep an eye on bandwidth hogs. Unlimited plans are never really unlimited. There is usually fine print. Get a contract in writing that allows you to saturate the link 24/7/365 and be ready for sticker shock. A few to several $k/mo.
i really isnt good press to, lets say, accuse subscribers of Criminal involvment based on IP spoofs or hash collisions, so its a good idea to chase it all the way down to the drop line, and any pwnd boxes