OpenStreetMap (OSM)

It is rare to find a project with such a ridiculously high importance over funding ratio.

E.g., as of 2020, their help login help.openstreetmap.org/ shows MyOpenID as an option, which was discontinued in 2014, and not Google OAuth.

Complaints:

Transliteration is off by default!...... wiki.openstreetmap.org/wiki/Translation You just have to learn all scripts ever. Good luck with the Chinese characters. Genius.
In order to see information about places, you have to click "Query features" on the toolbar first. Who made such a terrible UI? Direct click is a much, and so easy to implement?
It is impossible to discern different types of paths and other walking path symbols, the symbols are too small, and just scale down to a line no matter how much you zoom in.
Power lines are way too visible. While that is kind of cool, it is useless and distracting to most people most of the time.
No street-level imagery...: help.openstreetmap.org/questions/1178/adding-photos
No aerial imagery: help.openstreetmap.org/questions/6849/how-can-i-see-the-aerial-imagery-without-editing-the-map But that is kind of understandable, as that one might not be free.
No restaurant ratings: help.openstreetmap.org/questions/64852/ratings-for-pois because it is "Subjective". OMG those people, such a huge value powerhouse wasted.
Not just for restaurants, but for other things as well, e.g. sharing of good cycle circuits.

All of this is a shame, because they do have some incredible data that you cannot find easily on other maps because people just edited it up.

 Ancestors