For the fun of it, I think. I started a YouTube channel back in 2017 and had some degree of "success". The goal of the channel was to share what sorts of things I was working on and what I learned.
I kept putting more and more work into my content. Some videos did well, and some got practically no views. At some point into it, I realized that I was doing projects to create YouTube content and that I didn't enjoy the process of editing videos. I was spending 30-40 hours editing a 10 minute video because my production standards kept getting higher and higher. So I stopped.
Sometimes I get the urge to make a video and when I do I try to limit myself to a couple of hours to get it done. My last video (published in October) I spent around a day recording and editing because I was pretty proud of the project. It had pop-culture discoverability, and I thought people would find it interesting and valuable. I posted it around on social media a bit, but didn't get too much traffic from social media. I posted it at the end of October and so far it has only gotten 100 views.
By contrast, my most popular video got that amount in the past day. It is what YouTubers call an evergreen video. That single video makes up about 80% of my channel revenue which is down to about $25/month now. At the channel's peak, I was making up to $200/month from ad revenue on the channel.
I will continue to make occasional videos when I feel like it, but I am not trying to make anything from my content.