Logseq eventually added an open source option, but that it fails to keep sub trees collapsed pretty much kills it.
My current favorite note applications are Dynalist and Workflowy, but during my use I have always had a bad stomach feeling about privacy, inability to use it for work related stuff and always thought "this needs some features breaking out of the tree structure".
I'm not entirely sure Athens is trying to be exactly what I'm thinking of here, but getting competition in the space is great.