Requirement for running public bostr relay:
1. You could handle this daily traffic like the following.
Discussion
Every 30 seconds consumes 20 MB on average.
Good you shared sample data if the relay is kept fully open for use proxy + relay by many users but it is not mandatory param for network
There can low end free relays, high end performance n capacity free or paid relays etc. Bandwidth can rate limited at linux level based how much admin can afford to allocate.