Hard to say. Different regions will have different "tools" to use. For a large round, it's probably because they need to cut a lot of staff ASAP or because they have the offshoring ready to replace them. Paying them off is best in those situations.

If you need to fine cut a few particular teams then poking it with an RTO is better than giving them a severance package. This is all conjecture, but that's probably what those up top are considering with every move.