I don't think he broke any US laws.
Pretty sure be broke US extortion law when he offered north of 100,000 dollars for a thread takedown, and then threatened to kill himself and blame Null if he didn't take the money. And then he actually went ahead and carried out the threat of reputation destruction if not actually doing the deed.
Title 18, chapter 41, section 875
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(d) Whoever, with intent to extort from any person any money or other thing of value, knowingly so deposits or causes to be delivered, as aforesaid, any communication, with or without a name or designating mark subscribed thereto, addressed to any other person and containing any threat to injure the property or reputation of the addressee or of another, or the reputation of a deceased person, or any threat to accuse the addressee or any other person of a crime, shall be fined under this title or imprisoned not more than two years, or both
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Even under a strict reading, this meets the qualifications for the act.
1. Thing of value: Byuus thread. Byuu valued this thread to be worth 120,000 dollars. Whether or not it's worth that is immaterial. It's value to the perpetrator is what is important.
2. Threat: the proverbial "or else". In this case being the threat to kill himself and blame the kiwifarms
3. Injury to Property: the dreamhost contract (which IS property under color of law) was lost
4. Injury to Reputation: just do a Google News search
5. Was the threat credible? Of course. The threat was actually carried out.