Addiction is largely a GM hand-wave process, even the rules for getting addicted are pretty much "when the GM feels like it, roll an addiction test".
First off, as a GM, I would probably veto the addiction negative quality for someone who's going to be constantly in contact with his chosen drug (hacker & hotsim, in your case).
Secondly, if he's constantly in hotsim-VR, and we'd agreed to stick with the "hotsim is addicting philosophy", I'd be calling addiction tests pretty frequently.
At this point, entering secure, Matrix-restricted / -isolated facilities would be pretty rough on the hacker, and there's always that run to the dark depths of West Virginia. . .