Unable to answer "What can be left here for recycling?" – Recycling Bin – https://osm.org/node/6195518119 via StreetComplete 58.2:

Trash appears to be left at the spot, but it is not clear to me that it is for waste. I would vote that it is not for (public) trash.

Attached photo(s):
https://westnordost.de/p/230181.jpg