This tactic has been used against companies friends of mine have started. I've only seen it used by large 20+ year old 1970s/1980s publicly traded companies, never someone like Tesla. The way it works is basically that you track where your ex-employees go after they leave. If they go to a competitor/disruptor start-up with out deep pockets, sue that competitor over trade secrets. It's nearly impossible to disprove in…
Full disclosure: I do agree that there is such a thing as going overboard, but when your top engineers get recruited to a new company doing the same exact thing and take their laptop with them, that's a bit much. Especially when they load up all their drives with documentation before they leave.