Not sure why exactly, but if I had to guess it’s probably a lack of marketing people in the FOSS world in general.
Recently I’ve only really seen recently the End of 10 campaign from the KDE folks gaining a bit of traction, but even that’s more vaguely pointing in the direction of Linux than anything.













Adding onto that, the app StreetComplete makes contributing stupidly easy. You basically get a bunch of quests generatef around you with missing or potentially outdated data that you can fill in by answering simple questions. Basically Pokemon Go, but infinitely more useful.