One more thing: the Uber help page states that they "permanently delete your account", but also includes this sentence: "Please note that Uber may retain certain information after account deletion as required or permitted by law."
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.
That covers the "required" part of their statement. But they also have the weasel phrase "as permitted", which is far more open ended. In much of the US, for example, the law does not expressly state what steps a provider has to do to "delete" your account. So implicitly, they're permitted to keep what data they like.
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.