Notesnook. There's quite a lot of private, secure, foss note taking apps, take your pick. Just check what features they have, eg some of them have no encryption at rest
I'm excited to see they're going fully open source. Looks like the last steps to making the sync server self-hostable are in the works. Do you use their paid service? If so: any complaints or caveats?
I do use their paid service, though I'm considering cancelling to switch to using a markdown editor with syncthing for notes. I wouldn't have any complaints about the paid service specifically. I'd say it's a fair enough deal if you can get it on a sale. My reasons for wanting to switch are because I don't like using cloud services when unnecessary, and to a lesser extent I'd prefer a native app over an electron app