It is never useful to borrow money or bitcoins as you have to give back more
well if you borrow bitcoin for a valid reason and you have a confirm source of income and you know you can pay them back then it is not that much bad.
but if you borrow bitcoin for gambling(most of loans being taken for gambling reason) then it is not good at all. if you loose that money the situation sometime gets worst for you.
If you want to borrow a bitcoin there should be a clear explanation and will usually be asked also to what is bitcoin you borrow, if borrowed bitcoin just to play a gamble I don't think you will get a loan