The aim is globally, we're working on speeding it up and cleaning out trains and water... We'll probably finish the US within a few days and move on to the EU or other places.
Can imagine train traces particularly being tricky. Might have to build a separate routing graph of just train lines and filter out any traces that match that too strongly - though I don't think people mapping train lines in OSM work too hard to get train lines' routeability right...
So far as I was aware, TomTom provides a commercial alternative to OSM data. Them helping OSM in that context takes some rocket calculus / is a valid question.
Their main products are centered on fast GPS tracking solutions, which works really well with maps and mapping out maps, but at the end of the day are "just" coordinates. Selling maps in and of themselves is not their core product.
TomTom has GPS traces, but if those traces lead to OSM crowdsourced corrections without rolling a vehicle then they get better data faster. This may be particularly relevant for highway changes with no associated street addresses.
- provide OSM as a second option in their map products
- gradually switch over from proprietary data to OSM
- switch to OSM but only in select countries
- do something else entirely?