Who throws out cake?

I found this on/next to (since part of the sidewalk is crumbly, I’m not sure how to officially designate this) the sidewalk in Bushnell Park on Monday (3.14), which is known to some as Pi Day. The obvious food associated with the day is pie. Is this protest? Is this a kind of “let them eat cake”gesture, made to those who spend a lot of time in the park?

Most likely, no thought of any kind went into this. People are just plain wasteful.