It's the same principle as most of the content on /r/diwhy. A normal DIY video takes more time and effort than something like this, so you can churn out videos

It's the same principle as most of the content on /r/diwhy. A normal DIY video takes more time and effort than something like this, so you can churn out videos in a rate that gets you prioritized by the YouTube recommendation algorithm. In addition to that, these videos have a better chance of becoming viral, as many people share them to make fun of them, especially children and teenagers. I have been mostly successful in training my YouTube algorithm to not show me these videos, but if I'm logged out it seems like they are a lot more popular than "genuine" DIY content. It is of course possible to view these as entertainment, and I don't want to criticize the people who do, but it is rather annoying when you have to wade through a lot of crap just to find some more obscure DIY projects that actually have a chance of working.