Next step would be the need to upload pictures before and after so you have the ability to contest any false claims.

I'm partially kidding, but seeing how much time I spend 'starting' and closing a car in a car-sharing app (making pictures of all corners, all areas), a better approach to these processes would be welcome.

Uber Yelp for pooping.

Wasn't there an app that did this? You could review public toilet and mark stores that let people use their toilet.