It's totally plausible, just pointless for most of us to spend any time thinking about. If someone with $200,000 wants me specifically dead, I'm going to die,

It's totally plausible, just pointless for most of us to spend any time thinking about. If someone with $200,000 wants me specifically dead, I'm going to die, one way or another. This tech doesn't substantially change the likelihood of their success. If they want to cause a mass casualty event, there are already much easier ways. Once we tackle some of those, we can start worrying about this.