Spot on perfect. I see this too often and not just in tech.
Their rationale? “It’s mine, they owed me this”. They are 100% convinced that they are in the right, not just that they can keep it but that they actually intended to send them this to begin with. I get it $100k isn’t nothing but they’re also throwing their life away for less than what they used to make a year in salary.
People do weird things when given sudden access to money or power.
My first thought was I hope they didn't make this mistake for everyone, and second thought how do I safely return this.
(Turns out it was a one off mistake, and returning the excess was pretty straightforward though probably the largest bank transfer I've ever made)
10 years ago my last boss told me one last advice before going onto entrepreneur ventures: « be careful, people do become crazy and stupid with money » (and I guess he knew what he was talking about…)