Transunion can't do shit about some Belarusian teenager stealing your identity any more than anybody can indict them for deploying ransomware on government networks. The framework for prosecution of international cybercrime does not exist.
Domestically, Transunion absolutely will shut down access to data furnishers who do not vet employees, in cases where an employee is bored and looking up their exes and random celebrities. It is a violation of the FCRA and subjects the bureau and the furnisher to fines. The bored employee scenario usually just results in termination but if there are other factors at play like identity theft/fraud, law enforcement absolutely gets involved.
This rogue employee scenario is the mechanic I'm guessing is being exploited here, only it seems crowdsourced to obfuscate attribution (so one person isn't making hundreds of fraudulent requests that gets them noticed).
This stuff happens at Equifax all the time too. People are always trying to look up Donald Trump, athletes and rappers in misguided attempts to see how much money they have or where they live. (Celebs have taken to getting around this by buying properties in relatives' names.)