...The best claim is based on increased electricity usage. ...
Au contraire... Comcast is usurping location and operational resources of a residence for a business purpose. The best claim is that Comcast should not be doing this without the explicit permission of the property owner.
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On a customer by customer basis, there can be an attempt to explain away this theft of resources by saying that the resources used are negligible, and that the homeowner should not complain about such a negligible use of the homeowner's resources.
However, I look at this differently, it is absolutely and completely up to the homeowner what resources the homeowner wishes to share with Comcast.
And what is the cost of this theft when you look at all the installations across the country that Comcast is deploying in private residences? How much money is Comcast saving nationwide because Comcast does not have to establish a nationwide hot spot infrastructure without stealing its customers' resources?
And then there is the aspect that this may be against zoning regulations in some areas, i.e., operating a business operation in a residential neighborhood.