The German police have successfully deanonymized at least four Tor users. It appears they watch known Tor relays and known suspects, and use timing analysis to figure out who is using what relay.
Tor has written about this.
Hacker News thread.

    • Imprint9816@lemmy.dbzer0.com
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      15 days ago

      I doubt it. I think OP wanted upvotes and didn’t read carefully. Something like “tor user de-anonymized via retired app” would of been more accurate.

      This is another great lesson that even the best privacy tools can’t protect a user from their own bad opsec.