I believe the founder mentioned that they will eventually allow you to encrypt your data.

If you do any sort of public writing, you could use it for your writing process since that info would be private eventually anyways. Or you could expand that idea and include anything which you would be okay with being public.

For example, I may not have a reason to share a snippet from an article, but I wouldn't be bothered if it became public. I may also not be bothered if notes on that snippet were shared. And maybe if I did some writing for myself for understanding a subject, then that might be fine as well.

That's pretty much how I use the app.