People do this all over the place. We just don't want to see it. If people don't want to see it don't click on the dang videos! YouTube isn't going to ban fish cruelty, they have better things to do. ... like block child pornography....
I've accidently clicked on one of those videos where they're feeding a live mouse to bass? (I think) before. It wasn't labeled as being that or anything (I didn't watch it as soon as I saw the mouse I stopped it knowing what was going to come), so no... we can't just not click on it if we don't want to see it.
I was saw photo of a womens shoe I think the style is called pump and its heel was made of clear plastic and housed a small goldfish, with a few pebbles and a small plant. This was back in the 1970s or early 80s.