[d1sxeyes]

If Google removed all social functionality and user contribution possibilities from Maps, then they'd still be able to monetise it through ads and users would still be the product, so that's not really relevant to the discussion.

I would argue that the product does not require unpaid work to function. The other question is whether OP providing reviews to Google is a) really work, and b) really unpaid.

I think there are good arguments it's not 'work' (although this is more of a question of semantics), but there are very strong arguments it's not unpaid. Obviously there's no exchange of money, but Google offer a platform for reviewers to share their thoughts and ideas with an audience.