Idea: an open website/app that updates POI information on every known platform simultaneously. To POI owners it would be a win because it means their info is reaching more people but there's not much extra work. The hard part is spreading the word, but I don't see why an open project's donations can't go towards marketing. The marketing material can also be used to promote the existing open platforms like OSM and some of the open review websites(mangrove.reviews and lib.reviews for example), such as sending free window stickers to POI owners that say "Review us on **!".