I think that is absolutely horrible! But..
I also allow my dogs outside unsupervised. If I were to be outside with them everytime one of them had to pee I would be out there all day. We have a secure, fenced in yard. We have a pool, but there is no water in it...and the dogs don't go in it anyway. And nothing else they can get into. they have access to outside all day, and then at night they are brought in for about 8 hours then let back out again.
I also allow my dogs outside unsupervised. If I were to be outside with them everytime one of them had to pee I would be out there all day. We have a secure, fenced in yard. We have a pool, but there is no water in it...and the dogs don't go in it anyway. And nothing else they can get into. they have access to outside all day, and then at night they are brought in for about 8 hours then let back out again.