StreetComplete helps improve OpenStreetMap.

Let’s not clone trash. Tinder sucks because it has no matching mechanism to filter out incompatible people. To find one interesting profile on Tinder I have to swipe about 500 profiles. To get more matches, I risk some false positives and like ~2% of profiles. Then I need to filter the matches in person. Very inefficient, a waste of time.

The opposite of that was OkCupid before Match Group destroyed it.