Whether or not Mapbox collects more data is an interesting question. My guess would be they do, by a lot.
If you look at their website, Mapbox is all about "live" location data, insights, etc. The days of them just being a provider of nice services built around (mostly) open data are probably over. They have a huge userbase and can leverage all that data to do powerful things.
CEO of Mapbox said at State of the Map US 2018 that they are continuously collecting lots of location data (which they use to improve the map). They do not believe this amounts to the collection of personal data.
If you look at their website, Mapbox is all about "live" location data, insights, etc. The days of them just being a provider of nice services built around (mostly) open data are probably over. They have a huge userbase and can leverage all that data to do powerful things.