The common timing is bugging me. The trajectory doesn't seem to have been surprising over the last year, so why these exits now? Hey, anyone on the inside, did y'all secretly figure something out, got a computer god locked in the basement? Are rats fleeing a sinking ship? Please share with the class.
These companies have massively increased in value over the past couple of years and recently had tender offers where employees could cash out equity, so plenty of them have enough money to not have to work again. And why not get some free publicity on the way out?