I can eventually see regulations forcing companies to share particular types of data, such as that associated with accidents. Especially more unique accident scenarios. It'd be pretty limited in scope, but sharing that sort of data would have a pretty clear public safety rational even if they're just using it to build up simulations. No doubt there would be a lot of difficulty in just finding a way to make it portable.

I don't have the familiarity with what they're collecting (and how) to make any actual guesses on how you'd go about it.

Beyond that, no company is going to want to share their general data. There's too much time and expense behind its collection, and just sharing it wouldn't be enough; to make sense of it they'd have to share a lot of insights into their proprietary systems as well.