All airlines do, because they have decades of passenger data to work with and can estimate how many people won't show up, how many people will take compensation, etc. They have policies in place for every contingency.
Passengers don't like the idea of overbooking. But most passengers don't really understand how the sausage is made. And they don't care when the system works for them most of the time, just that it's not perfect, so booooo.
Passengers don't like the idea of overbooking. But most passengers don't really understand how the sausage is made. And they don't care when the system works for them most of the time, just that it's not perfect, so booooo.