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Re:Running a Tor Exit Node for Fun and E-mails by DaKnOb on Sunday September 04, 2016 @07:02PM (#12427156)
This has been done in the past: researchers visited a uniquely generated URL from Tor and then recorded which Exit Nodes visited it again. You can find their work if you google it..
Re:Running a Tor Exit Node for Fun and E-mails by brownbat on Sunday September 04, 2016 @09:46PM (#12427630)
https://chloe.re/2015/06/20/a-month-with-badonions/

"Chloe" visited unique web pages for a month last year, and also used unique credentials to log into a custom honeypot. Of the over 137,000 exit nodes tested, 15 attempted to use the credentials, 650 visited the unique websites.

Less than half of a percent, but definitely happening regularly enough to be an issue.