Simple. These companies need enough 'fitness' in order to survive and thrive. No one has the power to fight against the Nature’s Wille—survival of the fittest. They have to obey, especially when faced with the ruthless, life-and-death competition of the commercial world.
P.S. Hoping this comment doesn’t get downvoted too much and end up dead, not surviving.
By the way, standing as workers, I wish they wouldn't resort to layoffs as the usual route when facing challenges, but sadly, excel competence is required to make it happen, and not many have it.