When you don't do your chore, you're assigned the chore for an additional contiguous period. e.g. Floors are set to be swept every week. You didn't sweep the floors on time this week, so now you will sweep the floors the next 2 weeks.
There are group chores, but there aren't penalties for individuals missing group chores so that's a use case hole.
Shoot me an email to discuss more: keyan@choremate.co