Can Meituan upgrade all rooms for free?

You can't. According to the inquiries of people familiar with the matter, Meituan's free room upgrade policy is to attract more customers to book hotels in Meituan, so as to increase the order volume and market share of Meituan hotels. The free room upgrade policy does not apply to all rooms. There are certain restrictions on the rooms that can be upgraded for free, including limited quantity and unavailability at certain times, so Meituan cannot upgrade all rooms.