Mapbox offers traffic data that they collect themselves.
I don't know how accurate it is compared to the tons of Android smartphones sharing their location to Google, but in areas with many Tesla it is good enough.
Mapbox traffic and routing is pretty far from ideal. Used it for driving directions for awhile because of the relative cost and ended up constantly wishing we could just use Google. I don't recall specific issues though.
At least here in denmark the authoritative source for traffic information makes it available under a CC Universal license in the DatexII (european standard) format.
I don't know how accurate it is compared to the tons of Android smartphones sharing their location to Google, but in areas with many Tesla it is good enough.