It's banned in Norway. The piles are actually critical for navigation in bad weather. So if a local or a dedicated outdoors man see some unauthorized ones, they'll kick them over, even if they have to climb for them. I've seen one diverting some 3-4 kilometers from the main route, and he caught up to me and my friends whilst we had lunch. We asked him what's so interesting over there, he explained the situation, and why he took an 2 hour detour to kick it over.
Later, my ass was save by them, when without warning on a different trip, a thick fog came, i swear we didn't have more than 5 meters of sight. I literally couldn't see the back of my then 8 man strong group. We had to navigate with a minute of angle precision(!) by compass, to get from one pillar to the next(directions you got from the map, as the pillars are drawn as points). I'm so fucking glad three of us was scouts (Not the American group therapy scouts, Scandinavian scouts) otherwise we wouldn't have been able to navigate in that. The fog held for at least two days. I remember some swedes and some british people got lost, and called for help. The Swedes had a GPS, but didn't really know how to use it, but they was instructed to, and then met with a local rescue party. the british somehow thought the police could just pinpoint them. But It's not London, how are you going to triangulate a cellphone, when you're lucky to have signal to a single mast? They had to camp and wait it over. A lot of others was probably just close enough to a know exit, or not deep enough into the mountains to get caught.