I don't understand your point. Are you suggesting that people that pay a co-working space to work there should accept that whatever they're printing (most likely they're also paying for the pages they're printing) can be read by the co-working space?
I don't know if they should accept it but realistically vast majority of companies don't have any valuable secrets. Maybe payroll data and perhaps the client list would be somewhat sensitive. Still difficult to act on for anything but price discrimination.
