[direwolf20]

I think the idea is that if you have enough probes, one of them will be in the right location and network.

Tier 2 ISPs have the right incentives to peer with every network in every peering point, so you are likely to get a correct result from a different ISP. Tier 1 ISPs avoid peering, so if your probe or target is on Deutsche Telekom or Cogent, your packet takes a circuitous route, passing only through networks that paid the extortion money.

Friends don't let friends get internet service from Deutsche Telekom or Cogent.