I guess it's $100 for a bunch of videos of lecturer scratching on a whiteboard something that you can learn yourself with interactive demos, sympy and a jupiter notebook.
The difference is that there are also a bunch of other people learning the same thing at the same time. Peer pressure as well as due dates helps people stay on track, and there is support on the forum in case you get stuck, or just want to talk about something cool you found related to differential equations or math.
I found a couple of tutorials, but they're about using sympy rather than the theory, and they aren't actually notebooks:
https://www.sympy.org/scipy-2017-codegen-tutorial/notebooks/...
https://www.cfm.brown.edu/people/dobrush/am33/SymPy/index.ht...