Finger-printing is not PII. And the people blackmailing you because you're interested in both finger painting and the orficial applications of pine cones would not be entirely sure it was you. If they had an email address, name, or IP address with a timestamp, then they could be quite certain it that it was you.
I didn’t say it was. The original conversation wasn’t about PII it was about anonymising. Fingerprints defeat anonymisation.
I reckon in practice with for example an Amazon sales log with names removed and my public Twitter feed you could de-anonymise me with a high degree of certainty.
