[montag813]

Nothing short of a per-kilobit tax would stop people from working around the tax

That won't work either, once internet is delivered over power lines.

[Arthalion]

That won't work either, once internet is delivered over power lines.

Actually, the method of delivery is irrelevant. Even IP over AC will require an upstream router and an ISP, and it would be trivial for an ISP to count your throughput (many cable companies already to, do enforce throughput limits).