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It already says they want people to keep using Tor. Read the last slide:

> Critical mass of targets use Tor. Scaring them away from Tor might be counterproductive.

In other words, they'd rather only have to break one anonymization service instead of five.

If I had a few million dollars to run compromized Tor nodes, and the ability to subpoena (and gag order) any Tor node operator in USA, UK and a couple of other major countries to give me their keys, I would be able to easily de-anonymize a large portion of the network.

How many times can you employ that tactic until the savvy targets move onto more secure networks?

It is commonly assumed that the NSA/CIA run a substantial portion of the exit nodes. Morever, they are a global adversary (one Tor is not designed to defeat).

This is probably part of the Snowden files, so it was unlikely to be an intentional leak.