What does a hotel room rate of 0 mean?

0 room rate means that there is no separate room rate, so you can eat as much as you buy.

Have a minimum consumption, need to consume a certain amount of drinks, food, send the corresponding singing time, or need to collect room fees. This is not reliable, it's just a means of promotion. Of course, there may be other situations, maybe there is something wrong with the front desk system, which needs verification and maintenance.