That's a difficult one. I think the first reaction is to be outraged, but you have to consider how much wear and tear a foal puts on it's own joints. The amount of TEARING around they'll do, and leaping straight into the air and jumping logs in the pasture, I honestly don't think I see it hurting the foal if you're running it through a chute just to grab a video for potential buyers.
I don't know that I would personally do it, but having been raised around foals, they do FAR worse to themselves just playing.
I was watching the videos and I was thinking the same thing as MM I own a foal. And i'll say i'va taken him over a jump or too on the trails because we had to. And you gotta think. Horses arn't as fragile as we make them out to be. Even as foals they do so much running and jumping and rearing and all kinds of falling down and stuff. I think a jump every once and awhile isn't going to be bad. But if you were schooling them into a jumping horse that early then that's probably bad for the joints. But you gotta think out in the wild when they are running with the heard. I'm sure they jump streams and gully's and logs all the time. But of course out there horses don't live as long either. But that's just my 2 cents.