Also you could install it in things that don't look like it since it only needs an mostly unobstructed view in a cone to the sky. For example I could se an installation in a fake rain barrel, old bathtub inside a stack of firewood. some cloth coverings also would work so it doesn't have to be open either.
The only way to find the actual installations would be survey flights that take pictures and compare the data. Then send out inspectors to see if changes on buildings hide starlink antennas.
I think the only effect will be that the scheme will go away. Alternatively they could just improve their service so it competes on performance and price with starlink.
Finding it would be very easy as these houses are not huge houses, enter the house, snip the cables.
Besides that, its all hypotetical. Just because in some random shitty neigherhood this issue exists, doesn't mean anything anyway.
Very fitting.