Is it legal for Japanese food stores to refuse to bring their own drinks?

It is not a crime for a hotel not to bring its own drinks. It's just the overlord clause of the hotel industry

Not all restaurants are not allowed to bring their own drinks, depending on the place. Our restaurant here is more tolerant. Without this restriction, you can bring anything you want to drink, and there will be no fewer guests.

However, some local hotels are not allowed to bring their own drinks in order to make more profits, because the drinks in hotels are generally more expensive than those outside, so they can't consciously make mandatory regulations. Generally speaking, the business philosophy of different places is different, so it is not illegal.