This is actually something I really want to work on. There are many very poor academic-oriented videos on youtube, most of which are either someone with a tenuous grasp of the material explaining something in poor english, or a straight copy of a long lecture.

I think there is definitely a niche for bite-sized 5-10 minute videos covering focused topics in the undergrad/early grad curriculum in Math and CS. Like this is what a doubly linked list is, this is what dropout is, this is a walkthrough of a real analysis proof, etc.

You could add links to code snippets, github repos, latex papers, etc. And use animations/editing to make the presentation concise and visually appealing. Dabbling in something like this has been on my todo list for almost 4 years at this point