It's those pesky shadow realm people again, who are pretty much behind 90% of the incidents on the YouTube videos.
Edit: this chapter implies that people with blurred faces are actually direct targets of the shadow realm people, either when they are acting on their own or through a medium like the mangaka. Assuming that all FDQ content has a unifying "worldview", it really brings the dozens of photos in HELTER SKELTER (one of their most effective pieces of content) to mind.