For a debut, Tidy has done a great job of making this book accessible to people who aren't as familiar with the internet/hacking culture without it being jarring or annoying to those of us who are. The average person isn't going to know what a skiddie is, and I'm not going to know what the Finnish equivalent of 4chan is. The book is really well balanced in this regard.
I also find that the blend of discussing the overall culture of teen hackers while also interweaving the story of one of the single most prominent ones of the 2010s was an excellent approach. You get to engage with the life and thought process of Kivimäki while also exploring the underworld that he inhabited.
The book did have a bit of an awkward finish, but it's hard to bring it to a tight close when the whole hacking world that we get to see blossom in this book had started to change at the end away from the flashy attacks by teens trying to outdo one another.
Another part that Tidy started to explore but didn't get into in depth was the overlap of the teen male hacker culture and the right. I was thinking how when Tidy describes boys getting into the hacking scene by being drawn in while playing multiplayer games online is really similar to how white supremacists recruit young men from the same place.
There were also some small things that I think could have been touched up a bit - Jabber is referred to as a messaging service, but it'd be more accurate to call it a protocol, for example.
On the whole, though, the pacing is good and it was an extremely enjoyable read. I'd recommend for those who liked Dark Wire: The Incredible True Story of the Largest Sting Operation Ever and Tracers in the Dark: The Global Hunt for the Crime Lords of Cryptocurrency.

CTRL + ALT + CHAOS shed light to teenage hacking behaviours and the parties affected; the whys, hows and the aftermath of hacking.
- Some of the teenagers behind the hacks have severe autism.
- Some of the authority/law/order figures give nuanced insights.
- There is no win-win was one of my takes from this book, and it reopened some wider discussions around internet usage, data security, disabilities and how the societies and the state approach them.

CTRL + ALT + Chaos tracks Julius Kivimäki, a teenage hacker who progressed from breaching PlayStation and Sony to leaking therapy records from Vastaamo, all while anonymously extorting victims through Bitcoin.
I started this book knowing little about hacking and finished it deeply unsettled by how exposed our systems are and convinced that stronger laws are needed to stop something like this happening again.