High heel shoe sole has now gone. Why remove it?

The single high heel shoe sole I saw the day before yesterday has now disappeared. How did it get there in the first place? And why would you remove it? It was just rubbish, after all.
Related:
https://rumble.com/v5f8qfp-single-high-heel-shoe-sole-near-horseshoe-bridge.-what-are-the-odds.html
https://rumble.com/v5erk6d-the-mystery-of-the-discarded-shoes-of-fremantle-...-and-a-whole-lot-more-oc.html