This is a great example of clever people using advances in technology to do things that no-one would have expected. There are certainly issues of selection biases (i.e . you learn about what the animal likes, but nothing about other areas, but even a peek through the keyhole is better than looking at a closed door. And as more animals are used for this purpose we will learn more about different areas of the ocean.
and maybe even discover areas where *no* animal wants to go. Wouldn't *that* be cool?