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They have to say that because almost certainly they've used everyone's data in some fashion that makes it almost impossible to separate out. If they've got a count of everyone who used Road X and your ride(s) are included in that count, they're technically using your data but there's no way for them to remove you numbers from the count if they're only storing a total. So, saying they will have some anonymous data left over is a catch all for stuff like this. Sure, they could take the piss and just maintain everything but if they were found out the fines are large.
hippy-
Yeah, that is indeed a problem. I'd have similar issues at work if I was unable to continue using some of the patient data we have - while we can remove that individual's data (that's what someone stores a data key for) from the anonymous-to-me database, there's loads of stuff we've already done with that data or based on that data that you can't just separate out anymore. Which is why the whole idea of 'owning your data' is a bit wobbly anyway.
But don't you sign all that away in the terms of service?
Kinda, partially, yes, as I already said: By agreeing to their privacy policy, you agree to them using your data for stuff.
SwissChap
They specifically say not everything will be removed, and they'll keep using some data without having it associated with your name.
I don't actually mind though, that was not the point.