Unsecured means without collateral which is $3bn market. It is readily used terms by banks and cash lenders. It has nothing to do or feel with insecurity.
Without collateral? Well, if you find a platform that gives loans without collateral, tell me about it!
They did exist for a while -
BTCJam used to be really "popular" a few years ago, though I think they had very high default rates and most people ended up trading their
BTC for someone's identity proof with no means of hunting them down. It seems like
BTCPop is still around, but I have no idea if people still fund no collateral loans today. (or if they're even still legit)