Exactly, only humans should have at least one chance to grow and improve. Orgs are heartless legal entities that deserve no loyalty whatsoever, they are all one acquisition away from turning on you (as a customer or an employee).

Organizations are made up of humans too... but, the bigger they get, the less you notice that. Back in the day when GitHub was still a small company with one (very good) product, I can understand having a feeling of loyalty towards them. Since they are part of M$ and more beholden to M$'s KPIs then to their users, sticking with them only because of nostalgia is probably ill-advised.