He's lucky they didn't find a way to use it for card washing.
If someone took money out of your pocket would you call it stealing? What if they gave it to someone else, like a past employer or your parents or a humanitarian organization?
By the way, you should check a dictionary. The definition of "stealing" is literally taking something away without permission.
Protect your keys.
No, it doesn't.
So if I get your house key I can use your bathroom?
Seriously, what hill are you trying to die on here?
Can you name an instance of stealing that could not be described as a forced refund?
Respectfully, what the hell are you talking about?
Imagine you work 40 hours making an app and I pay you for those 40 hours. A third party comes in and says, I'm forcing a refund here - you lose the money you made, but you get the app you made.
How do you feel about this forced refund?
I am not saying it is the most likely case or even ethically justified but it is definitely not a super unlikely one. Anyone who thinks that's an impossible scenario has not been in the hacker's shoes.