Ask HN: Uber signed me in as my ex on download

Has anyone downloaded Uber as a brand new install on their device and when you went to use it....it automatically signed you in as someone in your contacts; into their account? I did and do not have an Uber account.

This happened to me last night as I got an Uber for a friend and didnt notice until this morning that it had automatically signed me in under my ex's Uber account. An ex who is troublesome to me and who blew up my phone accusing me of cheating and threatening me.