This is not unique to Switzerland, it's pretty common for remote areas across the continent from Scandinavia to Kamchatka. I've been hiking in the Baikal taiga,

This is not unique to Switzerland, it's pretty common for remote areas across the continent from Scandinavia to Kamchatka. I've been hiking in the Baikal taiga, and it's pretty common for local hunters and travelers to leave money if you can't refill the hut with supplies.