@jonny I get the principle, & it may work for relatively mainstream data (sort of like OpenStreetMap labelling) but a _lot_ more challenging for specialist / niche data where the learning curve is steep & the result interesting only to a handful of specialists.
I'm not sure what good potentials would be, other than the obvious Wikipedia & OpenStreetMap, & they still need paid staff to build software & maintain data integrity, even if you took away hosting costs.
What is your ideal example?