Moscow qualifier.

The computer club is a private establishment, so they can refuse you entry without giving a reason. This doesn't violate any laws.

I think it won't be a problem to grab a bite to eat outside.

It's a private establishment in every sense, until an offer is concluded in the form of renting a computer station))))

However, if eating is prohibited at that station in principle, then that's it; I acknowledged this upon payment, which symbolizes agreement with the rules! If it is possible, with responsibility for the safety of the club's property, then there is no legal difference in where the food was purchased.... They can refuse later, when the rental period ends, but they can only terminate the contract before the end of its term on legal grounds......
....but that's just a side note, of course, arbitrariness rules, but common sense also sometimes has a say ;)

The issue, in my opinion, is simply about the convenience of both the club and the visitors... so I don't see any major problems :cool: