I respectfully disagree. Most of their course content is repurposed text from a textbook.

I’ve also heard some alarming feedback regarding harassment from the founders:

• https://www.reddit.com/r/userexperience/comments/8x3fvl/is_the_interaction_design_foundation_a_scam/e21f4te/?utm_source=share&utm_medium=web2x
• https://imgur.com/a/rMDJH

I’ve had a subscription to their platform years ago and was fairly underwhelmed.