What are the some mobile first web3 use cases you think about?

A lot people in this industry keep talking about web3 on mobile is the thing which will bring mass adoption, blah blah… but never really have a clue as to what would be those use cases where mobile can be the thing needed to accomplish – what I mean is – Snapchat is not a mobile-first product, enabled only because we can carry smartphones with cameras wherever we go – so, we can share the moment. Same goes with Uber.

What are such use cases which could be enabled by smartphone's unique features like – mobility, gps, cameras, etc….