I wouldn’t stress about it. I’m on vacation, not patrolling who belongs where. I’m not going to abruptly close a gate with a family right behind me. I feel like I’m nicer at Disney, lol!
Disney is not so worried about it, or there would be an attendant at the gate to manually check each band. So I’m not going to worry about it.
It makes me wonder what the proximity is on reading magic bands, like at rides for the pictures. Disney could just have someone walk-thru the pool area with a reader of sorts and easily bust people if they were so inclined.