This sort of thing makes me depressed. The videos are LLM slop. You're a confused student. You do a web search. You run into something like this. It looks high-quality and professional. It is dogshit which no one can understand. The result is a confused learner who feels bad about themselves.
At the same time, thousands of low-quality resources overwhelm good content.
Integrating with an existing resources like MOOCulus could add a ton of value, in contrast, but wouldn't have the promise of making the creators money.
Being able to create manim animations at scale is a value-add, but doesn't seem enough of a value-add to create a business which does anything other than active harm. But it seems to be trying to be one.
Most textbooks are bad too. It's worth looking at some sample content to find the good ones.
There are some incorrect premises here.
"The videos are LLM slop." - No, they're not. Watch them.
"It's dogshit that no one can understand." - That's not true. Try it.
Well you can goto any large library in the world and you will find a zillion books on Calculus. Part of the learning and developmental process is working out for yourself what is "good" and "bad". And that has a lot to do with what your background is and what problems you are using Calculus for. So I dont feel its a new issue. People who want something better learn to find it.