I am unaware if Polo takes a chunk of profits?
It is in their terms of use.
As far as "default insurance", they do not promise to back up losses. Some have suggested they might do so to avoid bad publicity, but that is just speculation.
I found it (kinda hidden and that did not appear there when I initially started lending if I am not mistaken). The bad: I need to pay some of my profits. The good: Polo has no incentive to manipulate the rates down.
Here is the only music vid that has been made on XMR
https://www.youtube.com/watch?v=2ofpaF5pkE8
there is also this one:
https://www.youtube.com/watch?v=bV5TrmjEK8c
Definetely more of the music vids are welcome, they are great also for promoting... Any vids that can even partially go viral is an excellent matter of marketing for mass adoption.