The target audience of the app is me and my wife. This is a "home-cooked meal" app.[0] If it's useful to other people, I'm glad, but I'm primarily building it for myself for the pleasure of building and the satisfaction of a tool that works exactly how I want it to work.

You could approximate it with email, but I want things that you can't do with email like letting recipients control the frequency of emails, making high-res images available without bloating everyone's inboxes.

[0] https://www.robinsloan.com/notes/home-cooked-app/