This is the initial version of the online editor, and its functionality will continue to grow. It will always be free, with monetization only coming from cloud storage (for those who need it). However, I don’t plan on making it open source.
Yes, I thought so considering you didn't make it open source now :) That's why I put 'offtopic' as I didn't think you are planning to. I need one of these for integration in a tool i'm making and I cannot find one, paid or open source, that is free enough to do that.
In my experience, if you need to customize the look and behavior of the editor, Lexical Framework is the way to go. But be prepared to invest a lot of time.
If you’re fine with the default setup, you might want to go with ProseMirror or TipTap instead.
Quill.js -> https://quilljs.com/