One of my ex-coworkers didn't like working at a specific startup and didn't think they'd be profitable, so he ended up moving to another. However, had he remain

One of my ex-coworkers didn't like working at a specific startup and didn't think they'd be profitable, so he ended up moving to another. However, had he remained with that startup for a few more years, he would've made over $15 million in stock options. Yeah, he's a little sour on that lol