It's funny that CAPTCHA a.k.a.

Completely Automated Public Turing test to tell Computers and Humans Apart

can be now better solved by computers and thus became useless in telling computers and humans apart.

 nostr.data.haus 

 yes.

it's an old attack, it will always be possible in the design of tor network given enough data and the overview of the network. 

there are two ways you can counter the attack. either constant bitrate with decoy traffic (super wasteful) or high latency services (think email with 24h delivery time). nostr.data.haus