Employment protections usually come with a probationary period before they kick in, so employers can remove bad hires early. This creates an incentive to remove new hires before their probationary period is up if they're showing any signs they might not be the best candidate for the job.
Even when new hires are good and the company wants to keep them, heavy employment protections favor longer term employees. If the business environment changes and they need to reduce headcount their hands may be tied in ways that require cutting the new hires before the tenured employees. This happens a lot in labor unions, too, where tenured employees have greater standing than new hires when push comes to shove and someone needs to go, regardless of performance.
And this person was removed before any probationary period, before they started, without cause.
Laying off employees by seniority is not the same level in my opinion.
I am sorry for your friend, I hope that he is doing fine, Is there anything that they can legally do for this to block?
> And there is some legal actions possible, though not worth it in this case.
I'd still suggest talking to a lawyer (or a lawyer friend, for free if possible!), I don't suppose just discussing these things would hurt!