I'd feel kind of awkward uploading pictures of a random swing set in a small town to the Wikimedia commons but yeah it does seem like they're okay with it. Not nearly as convenient as what StreetComplete offers but maybe I'll give it a shot...

Thanks, that's pretty unfortunate, but understandable why they wouldn't want to host thousands of images for free on a permanent basis.

Still, I kind of wish there were a better place to host photos of features. Google Maps makes it so easy to contribute photos of places, and they're often really useful information.

Thanks, I'll fix the spelling.

The relations though I'm not sure about. How else should I represent that these holes all belong to the same course? I don't think an area makes sense since this course doesn't really have defined boundaries, it's just part of the park. See also osm.wiki/Disc_golf#The_use_of_a_relation