Me too! It was such a fantastic experience in retrospect. I've never been so incentivized to learn than during my reverse engineering years.
I started off writing SCAR scripts for Runescape and then got into development for the Aryan bot and private RS servers (if any of those ring any bells). I remember deobfuscation tools being consistently released and updated, but I left the runescape scene for warcraft before I could that far involved.
I have a friend who worked on anti-cheat technology for a very well known gaming company. He in fact started off selling hacks for said company and was hired to protect against them many years later. It was entertaining because part of his job was to maintain his old aliases and create new ones and frequent all the hacking forums and IRC channels to listen in on all the discussions. He would even sometimes contribute random information as part of his ruse. The best part is when his team would leave secret messages to hack developers (like in the byte patterns of the signature scans or embedded within the anti-cheat modules that were being mapped into memory). They had a great sense of humor and the hacking community picked up on it and loved it.
I think coming from our background and having to work in a security capacity like that would be fun as hell. It's very open-ended and like a never ending cat-and-mouse game. I'm sure the Jagex security team felt a similar drive back in the day.