First of all, Haidilao is a catering enterprise, and its profit source is mainly realized by selling its own dishes. If customers bring their own food, it will affect the operating profit of Haidilao, which businesses do not want to see. In addition, in order to ensure food quality and safety, Haidilao may inspect and test its own food, which will increase the management cost and workload of the merchants.
Secondly, if customers are allowed to bring their own food, there may be some food hygiene and safety hazards. Some self-brought food may affect the hygiene and safety of food in the store, such as food allergies or food germs, which may cause unnecessary losses and risks to other customers and businesses.
Finally, businesses have the right to formulate their own business norms, which are legal and reasonable as long as they do not violate legal and moral standards. Customers are also obliged to abide by the merchant's regulations before entering the merchant's store, otherwise the merchant has the right to refuse to provide services for them.
To sum up, it is reasonable and legal for Haidilao not to let customers bring their own food. Customers can choose whether to eat in Haidilao, and if they don't agree with its regulations, they can choose to eat in other restaurants.