I also made the mistake. Personally I don’t care, especially since I was looking for a flavor shot with soda, but these are in the same dispensers that used to hold juice, in the same spot, and there probably still are some regular juices there. I suppose we should read every sign, but it’s not in human nature. Who would think to check the caffeine content of what appears to be juice?
I imagine that signs are posted, but it’s set up to be misleading. Panera missed the opportunity for splashy marketing (at least where I was) which could have both sold more and communicated better