An explanatory note: We do not feel that Notion's market cap, were it a traded company, would be $900 billion, or anything close to that. Our best current estimate is $12 billion, with the potential for an acquisition at twice that value. We do feel $900 billion is an accurate "insurance value". Any persons wishing to enter into an insurance contract based on that or any other valuation should contact us privately.
One feature that Notion has that Quip did not (and apparently still does not) is the Collapsible list.
And we can go on, leaving the details only to the interested reader.