A lot of people are criticizing Chanos for his earlier short position vs Tesla that failed. But to be honest, a lot of great shorters also targeted that one. Including Dr. Burry and Mark Baum. Interestingly, no one seems to criticize the latter two...
That said, PayPal is still struggling to keep above the $100 a share mark, after the recent tech-blowoff. Despite things don't look good for PayPal's future, it's still holding above that marker because the CEO believes in the company. You can tell because he's still holding his equity instead of selling off.
On the other hand, Brian Armstrong sold off his shares within the blink of an eye and went off buying his mansion and everything else. Obviously he not only has no incentive to carry on with COIN, but he had little faith in it going higher than the IPO, hence he dumped his shares. And to further add scrutiny, his board members did the same shit. Now I don't mean to point out the obvious, but when ever I've seen this behavior, it usually doesn't end well for the shareholders.
Brian Armstrong reminds me a lot of a former CEO, Trevor Milton from Nikola. Remember how he also sold off shares after the IPO and bought himself a mansion too etc? History may not exactly repeat, but it sure rhymes.