Unfortunately, I tend to agree. I was pretty excited skimming over the post, not realizing this was a hosted solution. Any good self-hosted alternatives with the same features? Or good thread about personnal knowledge management?
Best self hosted tools are Org-mode and nValt.
Neither have full feature set, or work collaboratively, but nvalt in particular gives a good 80/20.
We export to plaintext markdown that reads well in either, planning export to org mode with enough data for a good elisp hacker to build parity of main features -- will do sooner if we know there are takers for that.
Have seen cool analysis of JSON export in Wolfram Alpha.