It's kinda like how Bigfoot and the Loch Ness Monster could be real, and we'll never really know for sure, but most people conclude that they are almost certainly not real.
Some motivated people have spent a lot of time and money trying to find proof of those creatures, and come up with nothing but some blurry pictures (including some known to be intentional fakes) and conjecture. So there's not much reason to take them seriously.
Some motivated people have spent a lot of time and money trying to find proof of those creatures, and come up with nothing but some blurry pictures (including some known to be intentional fakes) and conjecture. So there's not much reason to take them seriously.