Was about to say they might be going by funding rather than size. But looked it up, and if this Wikipedia article is accurate, that doesn't even get in in the top 20 either.
I don't let the cats on the kitchen table if I'm there, since I don't want the cats eating my food... Especially since there is no guarantee that whatever I'm eating is safe for a cat to eat. And also, our cats are very very fluffy, which means they shed fur everywhere. I don't want cat fur in my food. I don't care if cats go on the other tables, but I take them off the kitchen table whenever try to get onto it.
That being said, we absolutely allow the cats in our beds. It is so nice laying down next to a fluffy little animal that trusts you. I don't know why anyone would want to miss out on that.
From the photo, it looks like in all the space this thing takes up, you could have just planted a regular tree. It doesn't make sense as an alternative in urban areas with limited space or whatever if it uses up just as much space.
That's aside from the fact that trees are helpful in keeping the temperature down during summer. I doubt whether this thing does the same.
Was about to say they might be going by funding rather than size. But looked it up, and if this Wikipedia article is accurate, that doesn't even get in in the top 20 either.