[maeln]

The Tor network does some network metric on each Tor relay and give them a weight to each node based on their performance.

It's not flawless but implementing something similar in WebTorrent might be possible and mitigate this form of attacks.

[woah]

If their goal is to be "decentralized" that might not fit the bill (depending on your definition of decentralized). I wouldn't consider Tor to be decentralized.