Joining a group

People can be added to a group by name before they have an account. When they open the invite link, or enter the group's code under New group, they pick their name under Which one is you, and everything recorded for that name becomes theirs. I'm not listed joins as someone new.

Someone added with an email address can only be claimed by signing in with that email.

Add someone on Invite people adds a person after the group was made. Anyone at $0.00 can be removed there, or can leave, except whoever created the group. Their past expenses stay, marked (left), and Halvies refuses any change that would give them a balance again. Someone removed can come back with the invite link.