http://rzuwtppveur6yh3n2in7trmddgrkuhww4eb2znykgjwubihfpljiyuid.onion
Thus, every router between sender and receiver learns that the sender is communicating with the receiver.
In particular, your local ISP is in the position to build a complete profile of your Internet usage.
In addition, every server in the Internet that can see any of the packets can profile your behavior.