What Uber comes down to is, I believe, essentially the same as the famous Zuckerberg chat message: 'They "Trust me". Dump fucks!'. Saying that isn't illegal by itself. But it shows a complete disregard for the publics' interests.
Every single one of Uber's actions could actually be excused. When, for example, Google admitted to capturing unencrypted Wifi traffic picked up by their Street View cars, I was willing to give them the benefit of the doubt, because that explanation seemed more consistent with their past (and future) behaviour than the alternative.
But the sum of Uber's actions leads me to believe they have misunderstood the causality their own motto proclaims, and are now intentionally breaking things in the hope that it will make them move faster.
Which makes me think that they're deactivating your account and basically keeping as much data as they can legally get away with.
Since I doubt any of the other companies on your list are openly ignoring the law and keeping more than permitted, the logical conclusion would be that Uber is just as bad your top contenders.
The only challenge is how to rank them based on ranking factors.
And though not directly related, data breaches do undermine a user’s ability to delete their data. So maybe some kind of formula to quantify data loss.
Just some ideas. Your work thus far is really eye opening and you have my thanks. I had no idea I was trapped in LinkedIn.