[vy8vWJlco]

This is where saturation flooding of meaningless garbage can play a role in anonymization. In addition to making timing attacks more difficult, bulk garbage data provides a cheap smokescreen for the anonymized traffic and participants, increasing the burden for storage and analysis.

I'm pretty sure even the NSA would have a hard time storing and sorting through the collective output of everyone's /dev/random or /dev/urandom.

It's also a very low-risk thing to do - less so than even routing. If routing, one can just top up a channel with garbage to whatever rate both sides agree upon. It needn't affect speeds for others.