Flutterby™! : RIAA hits snags

So you've undoubtedly seen that the RIAA has dropped accusations of Kazaa use against a 66 year old Mac user? The article says:

Cohn said she expects more cases like the Wards because Internet service providers like Comcast, used by the Wards, do not assign IP addresses to any one user but shuffle them around.

In my first (and, , I hope only) use of a Windows machine on the unprotected 'net, I'd taken my computer over to play games with the rat boys, and I was wondering why I was getting all of the instant messaging pop-ups and ads. Turned out they had their router plugged in roughly backwards, it was working just as a hub, and apparently Comcast was happily handing out DHCP leases to as many people on that line as asked. I've no idea whether they were reasonably logging IPs to cable-modem MAC addresses, but it sure seems like if they were this is the sort of activity that they'd be wanting to discourage or charge a premium for, so I'm flabbergasted that it appeared to work and that there weren't nasty messages on subsequent bills.