The reasons why the old restaurants in Hong Kong don't open branches are as follows:

1. This time-honored authentic food, with shops everywhere, won't be copied by so many people.

2. once copied, the quality control can't be controlled at all, which will lead to the disunity of products in many stores and the disappearance of the authentic time-honored brands.

3. Time-honored authentic food is a time-honored brand, which is passed down by the family, especially in the catering industry in Hong Kong. A small restaurant can be passed down for generations and will not open a branch.