Groceries, chores, IOUs, the thing someone made in a spreadsheet that everyone ignored. The reason it died is nobody could change it without asking. Now everyone can change it. Because it’s actually theirs.
Invite anyone you want to (change) your app.
The person who does the most shopping decides the categories. The person who hates vacuuming negotiates a swap. The list fits the house.
Shared docs die because one person owns them. These apps don’t have an owner — they have a crew. Anyone with the link can change the structure, not just the data. Add a column. Rename a category. The app fits how you actually live.