That's a huge loan do people here provide these, and if this person doesn't return?
So you created a brand-new account to ask this stupid question? You could have continued posting with your old account. And yes, it's possible to get such a loan if you provide collateral or if the lender trusts the borrower more than enough. It has happened before.
I do recall people some time build trust then try to get away with a big amount, about collateral when banks give loans then they also take collateral, people provide valuables, and properties. But it also doesn't stop a lender to not return the collateral, if its value raises.
If I open a lending service here then do I have to physically provide my address to every person I lend to here for collateral?
Apologies for the question, most of the threads here in this board are filled with people thrashing the person asking for loan, some folks have good humor and experience in relying to these.
Lol

private keys are not valid collateral (and if even dumb enough to say that you will use this as collateral)...
Sure, I'll bite: For a $4169 (preev.com rates) BTC loan, send me the private key for an address holding 60 LTC ($4970)
after I've moved the collateral to an address of my own.
But let me guess: you don't like these terms

There are others that offer accounts, I can't think of online collaterals other than digital currencies, or giftcards, Paypal would be a bad option for collateral, right?