You'd be surprised. Does Vonage or Ooma or Sun Rocket or any other VoIP provider put mechanisms in place to prevent you from over driving your pipe? No.
Those services are not similar to what ATT could do by opening the microcell to users outside the house.
Also, you have modified your stance from saying that AT&T should give this away for free to now saying that only those who understand how much bandwidth they have and what the impact will be to them should do this. How do you propose sorting out the different types of users? Will AT&T engineer their home network for them to make sure it all works properly?
I don't understand - I have not modified my stance that they should give it away free. They should give it away free to anyone who wants it, but yes, they should make sure that the people who get it know the extent to which it uses their internet connection. Someone on a $17.99 DSL connection would be told that if a full complement of users were connected, they might notice that uploading 100 pictures would take 20 minutes instead of 10 for them.
You also fail to acknowledge that this device covers an area of approx 5,000 sq ft. This certainly wouldn't reach from one home to 10. The benefit of this as a way of filling in network coverage gaps seems tenuous at best.
5000 square feet is a pretty meaningless value. After all, we all know that the range of this device would be a sphere, so why isn't the area measured in cubic feet?
5000 square feet, if you assume it's a measurement of a circle painted on the ground around the box, that's a circle with a 40 foot radius.
A 40 foot radius would easily include my townhouse and 10 others. I suspect anyone living in a city would include at least another couple houses. If you set one up in an apartment that got bad service, it would give a dozen other people access. I'm sure the tree huggers in San Fran would be jumping on this device
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Not to mention, we're not talking about the need to cover 10 houses, but 10 devices. Since most families have one cell company, a family of 4 would probably have 2.5 cell phones, meaning only three houses would have to be covered.
So we get back to my main point.
Enabling this device to connect 10 devices without manually configuring it to do so would benefit more than just the owner without inconveniencing the owner, provided that owner had a high speed internet connection faster than the slowest available, and provided that that owner knew of the risks to using it. It all seems very reasonable, and while the consensus here is clearly "mine mine mine mine mine," I don't think you would deny that there are people out there who would more happily share what they have with someone who doesn't.