Why are there so few MOOCs for the core college curriculum for a BS in Math? I've noticed that there are very few Massive Online Open Course (MOOCs) that cover the core college math curriculum, for example


Basic integral and differential calculus
ODE
PDE
Linear Algebra
Abstract Algebra
Probability
Statistics
Combinatorics
Symbolic logic
Complex Variables
Real Analysis


Anyone care to speculate what are the factors involved that make these bread-and-butter topics so much harder to MOOC-size or less easier to motivate professors to produce than Introduction to Water and Climate or Cybersecurity Fundamentals?  I.e. it seems that specialized niche topics receive far more pedagogical energy than basic ones.  But I know as a student that I would very much appreciate having the core fundamental topics available in MOOC form.
I feel that this is heavily driven by the job-market. Topics in academic mathematics do not possess the necessary buzzword status to make MOOCs profitable. Very few job postings ever ask for competency in abstract algebra, real and complex analysis, basic calculus, etc. Many job postings want machine learning, "big data," "artificial intelligence," virtual reality, etc. 

When a MOOC advertises its wares, very few people are going to click on an ad that tells them they can learn abstract algebra and category theory. A MOOC teaching Python and "data science" intrigues a number of people who believe that if they can just learn a little Python, all of the sudden Facebook will pay them $150k a year to do data science.