Someone was selling existing works that were originally just background music, with nothing more than sound effects added.
"The original work didn't include any audio. To provide you with the best possible experience, I secretly borrowed the work from the original creator and added some audio. Of course, this is wrong. P.S.: Feel free to watch or save it, but please don't share it elsewhere so we don't get caught."
It's hilarious that they're uploading this to IWARA.
Translated with DeepL.com