Unable to answer "Who is allowed to park here? Parking may be free or paid." for https://osm.org/way/552068593 via StreetComplete 50.0:

This parking lot is permit parking during weekdays and paid public parking on evenings and weekends.  Street Complete doesn't have an option for that.  Will update later.

Attached photo(s):
https://westnordost.de/p/124504.jpg
https://westnordost.de/p/124505.jpg