Google Docs has a limit of 50 collaborators. I think that with 100 collaborators it’s doing pretty well considering that we’re not a billion-dollar company.
The demo actually doesn't show what the paragraph above it claims (customizable, extensions, artisan etc.)
And the demo shows how you can customize the styling, the power of extensions and how that all can be put together in a custom way. But maybe it doesn’t communicate all that very well.
Keep in mind it’s an MIT-licensed open source project, we just launched two days ago and we didn’t even post it here.