> Please don't be like Udacity

Huh? Udacity has numerous free courses. They've never made a free course non-free. Any new paid course is developed with new material, and they're still churning out free courses.

Here's one of the gems from the early days of Udacity - Peter Norvig's Design of Computer Programs: https://www.udacity.com/course/design-of-computer-programs--...

And here's one of the early machine learning courses: https://www.udacity.com/course/intro-to-machine-learning--ud...