My question is, how do I assure a finder's fee?

I can assure you chain link is not more attractive to renters or buyers.

Failure to perform clause recommended to re-assure sellers?

The best way to get an unsecured line or loan for your business is to have revenue that supports that line and assures the bank you'll pay as promised.

While I'm sure you can make money if you really learn the area and buy right, I'm just as sure you can lose big time if you buy in the wrong area.If you want to buy in Detroit, or anywhere else in the US, get on a plane and go have a look in person.

I have been told that he is going to be banned from the platform, and assured that my name won't come up as the reason why. 

Yep this is one of those rules that's counterintuitive and could definitely trip up a landlord.But rest assured, you don't have to allow the tenant to drill holes.

LOL Banks use the SWD all the time selling REO/ORE properties excepting out claims or assurances as well as disclosure requirements that an individual owner geenerally gives.

With that said, the bank still wanted the bank statements going back 3 months because they want to assure that the money is yours and you have a risk in the game and they also need to make sure there is no money laundering going on. 

I don't know the legalities of this, but I can assure you individuals on the DNC registry do not want to be contacted, so best case scenario it's a waste of time, worst case scenario you may be on the hook for a fine.