Have you tried Anytype? It’s a combination of Notion and Obsidian, and it’s end-to-end encrypted, and everything is stored on your device. Still in alpha, but it has a lot of features already. Because it’s in alpha, they only give access to people who attend an online presentation of the app. But it’s worth it. And as soon as it exits alpha, the plan is to open source it.
The comment is from last September, completely unrelated to what’s happening now on the platform.