I put mucho $$ across my credit card but don’t gamble. One day, out of the blue, I got a call from Master Card security asking about, IIRC, a $250 gambling charge at a casino and I told them it wasn’t mine. The card was instantly canceled and reissued. It’s uncanny how much credit card companies actually know about each of us and our habits.
Another example is travel. In the last four years I’ve made two round trip auto trips to California from Knoxville, TN without any questions from the relevant credit card company, even though I put almost all of the costs for each trip on the card. My surprise came when I looked at each statement; it was possible to take a map, use the credit card statement, and accurately track wherever I had been and when.