Can’t answer the license stuff, but I’ve been using Docmost with a group of six other friends for about a year now and have enjoyed it. Mildly annoyed about some features locked on my fully self hosted and private instance but hasn’t been enough of an annoyance that I’ve cared to look for an alternative. We use it pretty regularly.

My actual biggest complaint is I made a feature suggestion a long time ago which someome was very kind enough to program and add a pull request, but the maintainer refuses to implement. Oh well.