[solipsism]

As a game moves toward completion they will hire up. As deadlines start coming up (e.g. milestones negotiated with publishers) you'll experience crunch times. When the game finally is released, they have a swollen staff that they don't need anymore as they transition into the planning/exploratory phases of the next game. They absolutely lay people off at that time.

This has been the case for a long time and is no secret.