Fair enough, it's protocol is open source and the apps are source available. Modifications can be made by individuals for their own uses, though. I think it's as close as you can expect to get with a mostly full-fledged Notion competitor.

In any case, I don't particularly enjoy AnyType, despite coming back to it a few times to test it out (and still maintaining my own sync server, despite not actively using it, in case I go back to try it out again after some demonstrably updates). Just pointing out that it's a less restrictive alternative.