Would people in the "good coverage" area be able to run repeaters for this kind of WiFi provider so that, for example, their friend across the street could be c

Would people in the "good coverage" area be able to run repeaters for this kind of WiFi provider so that, for example, their friend across the street could be covered? I'm not familiar enough with large-scale WiFi infrastructure to know whether they have mechanisms in place to prevent such practices (or if they'd want to).