I don't know, you could be surprised if authorities crack down on the perpetrator. It all starts with a small thing, and then the perpetrator likely gets a high off of the one minor thing and then goes to much higher levels of the offense. So while he's just sabotaging RenX servers right now he might proceed to sabotaging YouTube, Amazon.com or whatever. And these people will probably do even worse crimes at some point such as planting Ransomware on a website or server. Heck, I wouldn't be surprised if he put a ransomware Trojan or Remote Access Tool on a server to hack us all (is that possible to do to RenX players?) So I'd say it's worth at least speaking to a person in authority who knows what to do in this scenario, because these cyber criminals will only grow worse if they remain undetected.
It's a Publicity Stunt if set up by it's own team, not really if the impact is from an unaffiliated entity. But yeah, if this makes the news headlines or whatever then RenX will garner plenty of attention.