Are you under the impression that creating a list of the most popular relays would be a difficult task to accomplish?
Discussion
I don't think that we are a very valuable target. Most of us use at least 4 different means of communication.
Most of us are glad NOSTR even works.
If it goes down it will be in a situation that won't matter.
Tor gets attacked all the time and it still is a spooks best friend.
We are small peanuts.
My relay will just change tor addresses.