Wow, I was not aware of that. Should I delete the version I'm using?
Do you rather have an app on your phone with access to your files that most probably runs dubious software alongside? Or, do you rather not miss out on the elegance and convenience it provides? I guess the answer depends largely on the content of your files and your personal preferences.
Also, Google hasn't flagged the app, which I believe they would if it was malicious as opposed to made by a company that had issues in other apps. So unless there's specific malicious behavior tracked, which I don't see, I'm not going to get rid of it.
"The Lumen Privacy Monitor" developed by the ICSI Haystack Project collects statistics of outgoing tracking traffic and their app origin on your device.