Actually, most youtubers and videographers use DSLRs. I think I only had 1 wedding videographer actually use a video camera. Most had the same gear that I did. It’s their post production stuff (software) that was different. The lifestyle videographers I’ve studied with use their DSLR set-up too. The capabilities are really good. Courtney Holmes is a lifestyle filmmaker that I like to follow. She has the same set-up that I have. Finishing my first film is one of my resolutions this year. LOL I’m still learning how to effectively use the correct fps (frames per second). But that’s a whole other language than photography. It doesn’t come second nature to me like photography does.
But like most things, if you learn the technical aspect of it, you don’t need to invest in an expensive set-up. A good DSLR with a good lens will get you on the right path. And if you have a specific style, then you invest in the gear for that particular style.