Elon treats SpaceX employees this way and is expecting it to work the same - problem is SpaceX survives by hiring fresh graduates who want a prestigious mark on their CV so it doesn't matter if they all burn out and leave after a year because there's always new graduates. Twitter doesn't have that kind of relationship with its employees, it has nowhere near the industry prestige as SpaceX does, and tech grads have far more companies to choose from than aerospace grads do, so this is a self-immolating plan.