Because the cost of firing (dismissing) someone depends on where they have their contract. It might be zero cost in the US but the US is not the World. In Europ

Because the cost of firing (dismissing) someone depends on where they have their contract. It might be zero cost in the US but the US is not the World. In Europe it would cost them tons of money to remove hundreds of jobs in a single swipe. OTOH, let people leave, no cost for them.