What seems questionable? It seems like the wording is pretty solid to me. The obligations of everyone is well-defined. I can't think of a way that either could get out of their obligations while fufilling the contract. That is, except for the

or its equivalent in another crypto

line. IMO that could be a little problematic for @neoxian if @mango-juice tries:

1. Create a Steem Engine token, call it SCAMNEOXIAN
2. Issue themselves 1000 SCAMNEOXIAN
3. Place a buy order for 1 SCAMNEOXIAN at 1 STEEM, making SCAMNEOXIAN "worth" 1 STEEM
4. Issuing 1000 SCAMNEOXIAN to @neoxian and saying that it's "worth" 1000 STEEM

(of course I don't think @mango-juice will do that)

So while there is some wording that can be used to scam @neoxian, this is only a problem for @neoxian, and I can't see anything questionable that could be used against the loaner by @neoxian.