The post said they were fired without cause. I don't know about Massachusetts but in right to work states, people can be fired without a reason or a notice period, and it is up to the person to prove there was a reason that is illegal.
And the company has the money, legal team, and power.
And the person has, well, less money, and no legal team, and low/no power.
And that's why all layoffs and firings need to include why. There shouldn't be any of this without-reason dismissals.