Update: per reader comments below, Prosper has prematurely pulled this offer. Not good for credibility. We shall see if miles post for those who registered.
I went ahead and registered. I did not register any of my financial accounts. United miles are by far my most valuable airline miles. I am Africa-bound tonight and I have a long slate of Ethiopian and TAP flights ahead, all booked on United awards.
Not all devices are compatible. I tried with my Android tablet and it was rejected saying it is intended for a phone. My Android phone was fine.
I didn’t have the courtesy to look at the Prosper app. Is it something like Mint? Any use for people in our hobby?