What would you use it for?
Verifying the environment - e.g. are the roads not overlapping, still somewhat up to date, ...
With mapcomplete, it is literally clicking 'upload image', taking a picture and waiting for it to be uploaded?
In Belguim, we are importing the official building dataset into OSM, but it is a slow process.
What do you mean with "it's not accessible to the broad public"? The pictures get linked properly with an 'image'-tag, so it shows up in e.g. OsmAnd.
Someone might take pictures of benches and another one will add the info if there’s a backrest from home.
What about https://mapcomplete.org/benches ? Granted, it does not upload to Wikimedia commons - but then again, Wikimedia commons isn't the right place for thousands of (mediocre) pictures of mor or less identical benches. A picture there should be "qualitative" and either "educational" or "relevant".
amenity=drinking_water is a place where you can get drinking water. There is no requirement to be able to drink directly from the water jet. Even more, the 'fountain=bottle_refill' makes it clear that this is not possible.
Yes, I looked into this as well, but there are apperently quite a few, contradictory ways to do this...
I have some more time. The tag literally reads "amenity=drinking_water", meaning that one can get drinking water for personal use here. It does not imply the physical form of this, e.g. if it is a bubbler fountain or a water tap. In either case, the tagging for the wide variety of items isn't very consistent...
There will never be 'more momentum' if you don't build it. Just kick it off and host this person, others will follow.