So they mined crypto, installed backdoors, accessed camera footage... and the story is generally positive and defensive of them[0]. This clearly goes beyond "just a prank" and depending on the severity ranges from very irresponsible to anti-social and malicious. [0] for the record I don't mean it shouldn't be, it just sounds bad enough, so imagine how bad a non-charitable take would be
By 'backdoors' are you referring to the TeamViewer client they installed on a student computer in the back of a science classroom? If so, suddenly my grandma is now a leet hacker.
Imo, the actual tech achievement there (for that age) is building mining computer and learning javascript basics from video. Which is more then other kids can do and shows some self motivation.