Re: Hmmm. Wonder about --
I've been using a VPN for years now, not exactly for this purpose although it does serve for that. They can see the stream of packets and can keep a tally on the density and total amounts but that's as far as that goes, currently. It might be possible to use correlation of packets to get a thumbprint but that would be a pretty expensive function to pull of at the volume that the cable companies operate normally.
Should it somehow come to pass that they fiddle things enough to get me annoyed, I'll set up a VPS elsewhere (likely not the US) and end run them that way using HTTPS or some other encrypted protocol. And then we're right back again to "they know how much traffic and how fast, but WTF is it?"