This is one of the (many!) problems with how financial technology works in the US. Cards get an auth placed twice for the same bill (one without tip, one with tip), there's little to no card-based security in place when making purchases and customers don't get to hear about their transactions until many days have passed since the purchase.

Every time one of these discussions comes up, it always seems shocking how bad bank/card mediated transactions are in the US. It's as if you just give your open wallet to anyone. I've just moved to Europe and it feels like I've gone back in time a decade. I can't imagine what it must be like in the US.