> My guess as to why it was not specified, is that the corruption is so obvious to anyone who has lived it, that it is easy to forget that others might not get the context. It's like someone trying to describe how fish live, but not remembering to remind people that water is wet.

Yes. It's fascinating, HN is in most ways a bubble with a particular kind of leadership, but sometimes these cultural differences shine through.

To me, it's completely obvious that in the case of a plumber working through blat, he's not just legitimately doing extra work (assuming the law allows that in the first place). Of course it means the plumber is working on your pipes while he's supposed to be doing his actual job, or maybe he actually does it outside the hours but when he needs to replace some part for you, he steals it from his work. But apparently to people who grew up in a different environment, what comes to mind is legitimate side business.