I'd rather not add the address tags, but by no means am I sure about that. I've hence started a poll to ask the community for their opinion: https://community.openstreetmap.org/t/address-tags-on-bike-rental-stations-that-are-only-shown-in-app/

My considerations (in descending order of importance):
1) The address cannot be verified on the ground.
2) The wiki intends the addr:* tags to be used for buildings only (but this can be changed, obviously).
3) To "give a sense of location", data consumers can easily check the address of the building closest to the station.