MapComplete is a website where one can see and contribute to thematic maps. It show features within one topic (for example: public bicycle pumps). If a bicycle pump is selected, one sees more information about it and can answer some questions to help the community. If a bicycle pump is missing on the map, one can easily add this. There are plenty of maps available, each centered around a different topic (for example: playgrounds, public toilets, shops, public bookcases, waste containers and a map linking to the wikipedia article of the person/item a street is named after). All data comes from (and is added to) OpenStreetMap, so improving via MapComplete will also improve OsmAnd, Organic Maps and thousands of other applications.
no business model, no trackers, no ads. That seems to be very trade-free! Thus 5/5 blocks.