Spoiled onions and Tor exit relays

It's important to note that the 25 bad relays that were detected never where all active at the same time.

Many of them appeared serially: once detected, the operators moved the relay to a new IP address and got a fresh identity key.

For this reason and how Tor weights exit relays in the selection process, one should not be mislead by the “2.5%” figure. It never was the probability of a Tor user to go through one of these bad relays. The latter is much lower.