Because of what the parent said. They're probably making life harder for their coworkers even over and above encouraging companies to put these monitoring systems in place. (Assuming, of course, that multiple jobs is not considered perfectly legit as part of employment contracts/business ethics.) And, just to go all-in, if I had a co-worker doing this and I knew it wasn't allowed, I'd probably rat them out. In fact, I expect it's entirely possible I'd be in breach of some ethics guidelines if I didn't.
