Ink & Switch did similar with Muse app [^1], but spun it off when they realized it wasn’t a sustainable business for them [^2].

[^1]: https://www.inkandswitch.com/muse/

[^2]: https://museapp.com/end-and-beginning/

Haven't heard of muse before but it looks great!

Nestable approach with canvas management is more similar to notion than muse.

Nestable also has deep linking across the app so that you can leave hyperlinks to other pages or shapes from anywhere to enable better organisation and management.

Canvases aren't generally used as knowledge bases because more often than not, it gets really hard navigating them and nestable wishes to solve that.

In terms of making a business of out nestable, I have no plans for it. This is fully local and the only charge I incur would be for hosting which is very minimal.