Please don't forget that you can self-host it, so you can own your data. But yes, the administration burden "killed it" for me, too, or at least the enthusiasm to make further edits, although it is a really promising app. I can only imagine taking care of such complex task as your main hobby when you're obsessive to take digital notes of everything. It's not been a year since I've spent a couple of days creating profiles, taking notes of events, conversations, etc, so it might be helpful in a couple of years when I can't remember any of these notes. However, as a self-hosed app, it might not survive that long and I could shut it down to give its resources to something else. Still, a great project, I hope it finds its target audience.

Bitwarden, Lastpass, et al all use vault/blob encryption.

I would think a good personal CRM would as well - unless they themselves want access to your data or they just don’t care to do that work.