Why are you assuming the primary motivator is to serve ads? Smart TVs were already caught running content ID against the contents of the screen and phoning that data home. "Routing at the edge" is the euphemism for the logical extension of that.

> extra $25-100

Your estimated costs are off by at least one order of magnitude, probably two.

Of course none of this makes much sense in a world where smart TVs have ubiquitous wifi, most consumers have one, most consumers run the stock OS, and most consumers connect it to the public internet. It would be entirely viable if not for that status quo.