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Amazon is blocking promotions of employees who don't comply with its return-to-office policy, leaked documents show
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
It depends what's in their contract. I honestly don't know. I'm guessing based on zero experience of working in Amazon and am using my knowledge of European employment as a baseline. Of course, your mileage may vary in the US?
In the US, there is rarely, if ever, a contract. Unless you can show that you were let go for a legally protected cause (your age, race, religion, gender, and some other things), employers can fire you without any reason at all.
The only caveat here is the differentiation between for cause and without cause, as it impacts your ability to collect unemployment insurance payments. Employers pay those insurance premiums to the government and they are based on how often people let go from that company claim the insurance payments, so a company that lets go of a lot of employees is going to pay more than one that manages to find a way to fire them for cause or get them to quit.