[wukgwnfu] ISP that automatically does Tor

Create an ISP that automatically and transparently does onion routing but only within its own network which it is assumed to have low latency and high bandwidth.  This is to protect customers' privacy.  I am unsure how this would work, or even if it would work.

What would (should) it look like from a customer's perspective?  DHCP?  Could the same effect be achieved by very short DHCP leases rapidly changing IP addresses (and flushing DHCP logs)?  Are such logs subject to pen register subpoenas? Probably yes.