The MOOC bubble on the other hand (including edX to a certain degree) was both a novelty and depended on rethinking educational economics to a fair degree, which included credentials actually meaning something and that never really happened. The people taking MOOCs mostly weren't those not well-served by traditional higher ed; it was people who already had a Masters degree or two.
I was thinking about starting the the Spring 2024 6.5840 course just this past week. I ran across the course on YouTube while studying Raft and Zoo Keeper. I saw their labs and they have you build RAFT and a KV store on top of RAFT. I'd love to get the experience of building these. I have never written golang, but I am sure I could ramp up on it quickly.
How far along are you?
All the material except video is hosted on their website. No registration or anything. You run the test suites locally to verify that you correctly completed the assignments. It makes you wonder what happened to Coursera, Udacity and many other MOOC projects that were very optimistic and enthusiastic but got worse and disappointing in recent years. This is how it should be done.