The story around DPR getting caught started in him making posts that had personally identifiable information from his anonymous accounts in the very beginning,

The story around DPR getting caught started in him making posts that had personally identifiable information from his anonymous accounts in the very beginning, not from illegal searches. That's just a really long scraping / pattern-matching exercise of publicly available data, and the reminder that even particularly clever people won't be on point 100% of the time.