Comment by Animats

I'm still amazed those guys were able to cram the Habitat client into a Commodore 64. I can why Fujitsu didn't take the risk of trying to cram a somewhat more ambitious client into the tiny user side machines of the era. If it doesn't fit, the whole project fails. Here's a video of the gameplay, running on a Commodore 64 emulator.[1] Remember, this is 64KB (not MB, not GB) over a 300 baud connection.

The trouble with Xanadu was the business model. Everything is pay per view in Xanadu. It's all about micropayments. Really micro micropayments. Edit something by someone else, as with Wikipedia, and you get a tiny fraction of the revenue. Ted Nelson wanted to track the history of every snippet. Also, the design was all built around centralized servers. Not open at all.

[1] https://youtu.be/VmpAnhp31C0