well, my guess is the main reasons is they are not paid enough (or because they make a serious error and want to avoid trouble before it is discovered). they are paid peanut compared to both their military counterpart as well as the private sector that it is not really good news for PLA no matter how you look at it.
it wasn't until the last 2 year or so did official get a well deserved pay rise, clearly too late for this instant since the article appears fairly old.
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seriously while MNC may have strong influence today, they are still not the ones making the laws. if national interest is threaten, they will block and lockdown eveything. you see this is why even countries like USA resist total globalization. they will allow some level of "free trade", but never surrender the power to say "NO, go to hell!"