Benjamin --
I did listen to the recording. (Since you invited me to do so, I had no qualms about it.)
This is an obvious scam. The guy's claim to have an account that was (as he implies) randomly and inexplicably "blocked" as were "many accounts in Eastern European countries" (recently) fails on several counts: (1) His accent was clearly Asian, NOT Eastern European (most likely Chinese, to my trained ear) (this is consistent with the fact that although he used Skype, he chose to present a three-color triangle as his "photo"); (2) There has been no reported or known "blocking" of any regional accounts by UW, recently or in the long-ago past; and (3) He later conflates the "blocking" of his account with his account being refused. (Choose ONE fail, Scammer Guy, and stick to it!)
He wants you to use Teamviewer. It matters not at all that he wants this "only" for four months (!!!). As I understand Teamviewer, once a scammer links to your computer using it, you are helpless -- a bit like a paralyzed fish trapped by a poisonous sea anemone. You can gasp and moan, but your computer is held hostage and you are under the complete control of the scammer. I think that ten minutes might be enough for Death by Scam -- but, then, I'm not sure, because I have never allowed anyone to take over my computer or my account. The Indian and Pakistani guys who call me every few weeks from "Windows," to let me know that my computer has a deadly virus and is about to explode, are always trying to get me to let them gain control of my system by means of Teamviewer.
The whole thing is a complete scam. Maybe several different layers or options or flavors of scam. (If "Teamviewer" doesn't work, they'll just buy your account. As he says, a U.S. account is "more stable at this time" than is their account.)
He doesn't need or want a "reliable collaborator." He wants a noobie patsy.
