Fortunately my loss is actually zero, but there is someone else who lost because they lent me the bitcoin and it is stuck in my wallet. I want to do the right thing and get it back to the lender, but it sounds like this all might be a lost cause... Hopefully someone with better resources than myself can go after the CEO and administer legal recourse.
If you are communicating with the lender in any way - be careful. If the lender can dox you they can come after you even though from your perspective it's BTCLend who stole the money and not yourself.