Please! ! How do hotels prevent guests from running away from their accounts?

When a guest stays in a hotel, let the waiter take it and pretend to carry the luggage. In fact, when they arrive at the room, they will make an introduction (you can clearly point out that the hotel has services such as drinks, and you can choose the place you need, but you have to pay), so that you can clearly tell the guests that there is wine and they need to pay if they are short. The guest is not a fool, he won't know there is a nail in front, and he is still proud.

In large foreign hotels, why do waiters send guests to their rooms and charge tips? In fact, they just tell the guests what is extra.