There are two probable problems: a) debris damaging other satellites or space stations. There currently is no proper liability currently and different monitori

There are two probable problems: a) debris damaging other satellites or space stations. There currently is no proper liability currently and different monitoring systems are still in development b) astronomy from earth will see problems. As long as they are on their orbits there is enough space (haha) and if they don't cause conflict with radio frequencies they also don't cause issues