Traditional Culture Encyclopedia - Hotel franchise - Is it illegal for the hotel to upgrade the guest room type without authorization?

Is it illegal for the hotel to upgrade the guest room type without authorization?

It is generally not illegal for hotels to upgrade their guests, because upgrading is generally to a more advanced room type. This is because there are many orders for ordinary rooms. If there are more advanced rooms left, the hotel will upgrade them for free. Free up ordinary low-priced rooms to attract other guests to book.