In fact I've seen them (and other restaurants) do this first hand.
A customer is being abusive, or giving the poor checkout person a hard time - if they get abusive or threatening, the manager will often intercede and tell them to leave the store.
Likewise, I used to work in a electronics store - if a customer is a being a jerk, you're well within rights to ask them to leave (politely). Obviously it's the nuclear option - but there's definitely precedent for it.
It's not remotely disabling things they've previously bought from you.
That's quite a different kettle of fish.
"At this time your only option is to return Garadget to Amazon for refund. Your unit ID 210036...will be denied server connection."
How is that not being bricked?
(But the coffee cup is useless without coffee!)
However, linking the action to a bad Amazon review and publicizing the device ID both demonstrate very poor impulse control.
Here, I disagree (or agree with you, depending on whether your italics indicate e-sarcasm).
You could fill it with water or tea or make your own coffee or even sell it to somebody else at nearly full value! (I'm sure the restaurant support would be happy to welcome a new customer back to the fountain of coffee).
You get my analogy.