My cat used to do that all the time when my dog was a puppy. They played together incessantly- sometimes the dog and the cat would hit that ninja pose simultaneously, then resume grappling and chasing each other. Alas, the dog grew up and no longer indulged the kitty’s desire to play.
One of my cats often stands up like that to look around, especially to look out the window. I’ve seen her take a half-step to adjust her position without putting her front paws down. It’s rather cute.
The other cat… definitely not evolved enough. Cute, but stupid.
You have no idea how cats actually move and are talking out of your ass.
My dog can stand on his hind legs and remain there for up to 30 seconds if he thinks you have food. He can even walk forward. My old cat used to be able to do the same. Notice that the “Standing up” portion of the video goes for a couple of seconds at best? It’s just a cat doing what cats do - trying to make itself look bigger to a potential threat. There’s no trickery or video fakery involved at all.
I just love how the hind leg cat looked like an aggressive bipedal stance. It’s not just the hind legs, but that, for a split second, it looks almost human.
I’m sure there some much smarter Doper who can tell me a lot of reasons it doesn’t actually look like human posture, but that’s what I saw at first. Like a lanky human in a hoody, who did not look happy.