Releasing Exhibit C seems like a huge lapse in judgement from chess.com; they've supposedly redacted it, but there's so much information there that it has to be completely trivial to deanonymize. Like, just how many of the people with a 2700+ rating played in chess.com money tournaments until suddenly creating a new account in July 2020 and then didn't play in such tournaments for a year.

If that still doesn't narrow it down to one person, then the widths of the redaction black bars will finish the job.

Edit: Not sure where the downvotes are coming from, but just to be clear, Exhibit C is some totally unrelated bystander with nothing to do with the Niemann case. These emails, and by proxy the person's identity, are being published for no other reason than for chess.com to fluff up their cheating etection credentials. How is this acceptable?