Do people not get any messages when they make any transactions? In my county you literally get messages for every transaction. And you also have to add in otp for every transaction online.
I believe this difference is because in the US merchants are on the hook for fraudulent transactions and in the rest of the world the customer is on the hook.
So if someone steals my card and makes a bad transaction, I just go into the app, flag it as fraud/not me and no money comes out of my bank account. The merchant ends up eating the cost because it's better for them to eat a small fraud percentage than to add more friction to the checkout process.