I'm gonna bet $100 that this didn't really happen.
It's possible, as @hd49728 stated, that "children love art," so this might be true, but the OP needs to support this up with photographs of the youngsters drawing the Bitcoin logo.
Nonetheless, it is always a good idea to start our children with solid knowledge because they will develop with it. If they are exposed to Bitcoin knowledge at a young age, they will grow up with it, which will be really beneficial to them.