Presumably no consumer laws were broken
Actually, on second thoughts, I'd confident that to specifically and intentionally disable a capability that the device had when it was sold would comfortably breach consumer protection laws in all civilised countries.
I wonder if Amazon will be held to account?
No, I don't think so either; Amazon are presumably assuming that the las of the most consumer-hating of all US states can be unilaterally applied to all other US states, and indeed the rest of the world.