Great idea. This is in Germany and I have seen this person in Halle (Saale). Afterwards I checked out Bitcoin and fell into the rabbit hole. I don't know this individual, but I would love to see him again. 

When I saw him, he was partially masked and had a sign "Free Satoshi". It was in the centre of Halle. 

 What’s he doing “wrong”? 

 Nothing at all. In Germany it is prohibited to demonstrate without permission, so I guess that’s why they are there :)