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.
We have to consider the system as a whole. If the industry in question provides a clear social good, such as medicine or energy production, then there is a moral duty to snitch or perhaps confront the person and give them a chance to reform beforehand. If it's just some tech company, especially a FAANG, ratting them out just means helping elites and reinforcing systems of control for no benefit except to the elites themselves. Ethics guidelines are meaningless at best or a sick joke at worst when it comes to the vast majority of companies in the overall picture. Just another twisted, internalized abstraction in favor of the masters.
