Strange, I was curious what kind of images are there, did a search for "Taiwan", and the result is literally 8 pictures with "Shutterstock" watermark and that's all. Is that supposed to be CC0? Even if it was yes, would that be useful at all to have watermarked images like that?
Just tried the same thing. It looks like the Shutterstock watermarked photos were an advert sponsored by Shutterstock themselves. No actual CC0 photos for the site itself.