You send your btc to some users that you don't know and now call them scammers, but if they are scammers what kind of user are you who give btc to unknown and untrusted users?

At last the scammers was the users not the site, but is too sad to see site like that allowing that kind of scum, because at last is responsibility of the site to protect the users from scams. You must be warned by a moderator about the risk on lending. 

I will show you how to avoid scams;

1.-Never loan
2.-Don't trust all the users