It was one of early threats I described on the Tor network. NSA et all could easily pay for it to be done. Consistently. Year after year. I think the only reason they haven't is that U.S. and foreign intelligence services themselves find Tor so useful. Can't take down one's own tool for disrupting the competition. ;)

The advertised bandwidth for the whole network is much lower than the 600+GBps that's attacking Kerbs it's a little under 200 GBps.

https://metrics.torproject.org/bandwidth.html

Tor has too many friends. I dislike the trend of Tor being used to control botnets, but the upside is that an entire underworld now sees tor as an asset. Any non-state attacking Tor would make some very interesting enemies.

Without the particular bot net/what have you taking credit for it do we generally know who is running a DDOS?

Enemies? Hah, you mean extortion targets!