Sharp did the breach and then extorted Ubiquiti. Ubiquiti got the FBI involved and declined to pay off Sharp. Sharp followed through on his threat and disclosed

Sharp did the breach and then extorted Ubiquiti. Ubiquiti got the FBI involved and declined to pay off Sharp. Sharp followed through on his threat and disclosed everything to Kerbs, who wrote an article about it. The FBI and Ubiquiti were on to Sharp, but since Sharp was Kreb's only source, Krebs doubled down on the allegation with a series of articles, and then never retracted it (until now)