[crispy2000]

It's not really the "sharing economy". They are using the secondary wifi access points as a paid service to other subscribers.

In their defense, though, the routers are theirs, and they do allow users to turn off the secondary wifi access point. I don't have Comcast, but I'd be willing to put up with this if: (1) I'm able to opt out (2) I get some discount for physically hosting their access point, (3) Needless to say, the secondary traffic must not affect my use of the internet connection: e.g. reducing my own bandwidth, or counting against my quotas.