An interesting article. I wonder if anything in Tor has improved these issues in the 15 years since it was written? A lot was about bitorrent itself having issues, but the third point could be of concern, if it still is an issue.
Discussion
I think the issues was architectural, and that may have improved, but I also think that “the state” could inject enough nodes into network to uncover the origin.
I think for a lot of people using a proxy relay could be a good choice. I'm actually connecting to less relays on average than I was before when I set it up that way.
Is it a default though? The defaults will be used in majority of cases
No you gotta set it up, default is outbox mode. I'm not sure what relays would be a good choice for that and are free. I use my own WoT relay & Nostr.land, but I think aggr.nostr.land needs subscription, and a wot relay is less useful if it's not configured for your own npub.