Footway in subway stations should get tunnel=yes?

In general subway stations should be considered buildings, tunnels or both?

I don’t mean the tracks where the wagons ride but the wider spaces where public citizen are allowed in,
all the space that usually host facilities like amenities or shops on different levels, and the stairs connecting them.
I checked very few samples and many seems to be tagged as tunnels.

The question come from this MapRoulette challenge: (about this way: osm, indoorequal)

I should remove the tunnel=yes tag or add something like layer=-2;-1 on top of level=-2;-1?

For reference:

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