Random piece of news stating the guy was arrested not as a TC developer but because he was actively involved in cash recycling.
Not that this changes much in the situation, but it is only a bit less worrying as he wasn't arrested for only writing code.
Apparently this is the reason.
The fact he was a TC developers has little to do with the arrest. The reason why he was arrested is because money laundering:
Alleged Crypto Ransomware Money Launderer Extradited to USThe US Department of Justice accuses Denis Dubnikov of laundering more than $400,000 in funds lifted from Ryuk ransomware attacks as part of a $70 million scheme, according to a statement by the Department of Justice on Wednesday.
Dubnikov and others involved in the scheme are alleged to have laundered funds from the attacks through various national and international transactions in a bid to conceal the funds’ provenance.
This means he was directly involved in the money laundering, not only providing the TC protocol.
Then, we can discuss why/if money laundering is a criminal offence or not.