It is very different outside Berlin too. But one of the reasons is how most of the clubs here are very queer friendly, and it is easier for people from different backgrounds to go there if they know their presence there is not leaked to their families from some photos.
I also noticed that underground parties in countries like Finland started to follow this trend. In these cases it is more to filter out cameras on dance floors which obviously makes the parties more fun when people are just not using their phones all the time.