I am also concerned about the adequacy (and usefulness) of tagging dropoff points for shared bicycles. I myself have mapped sporadically in the past, though not in a consistent fashion.

When reading through the wiki for 'bicycle_rental', the case of Singapore borders the case of virtual drop-offs, or 'bicycle_parking=floor'.

https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dbicycle_rental#When_to_use_a_different_tagging_scheme

Keen to read your thoughts!