Zero risk
Nothing is zero risk. What is the site providing this escrow service? Have you checked them out for reviews or Scam accusations on this forum? Are you that concerned with KYC or being tied to your credit/bank account info when you buy?
There are significantly less expensive and risky places to buy even at the 1 BTC level. Some don't require KYC either. No matter what unless you are buying it with cash in person you will be tied to this purchase in 1 way or another if someone really wants to look into that much.
Also of note when people are giving you a real good deal, there is a large chance they have figured out a way to scam that service. I'm just saying be cautious.