I think bitcoin lending is a good business. You lend out bitcoin and get back bitcoin, it is like holding bitcoin but with some interest.
It does seem like an ok business, you are not going to earn too much money because most people only take really small loans (probably to gamble or to build trust) and you will earn a small interest of a small loan but eventually you will make good profit the only problem is that some people are giving loans without collateral already so if you want your business to work for you, you will have to give some loans without collateral too and that is a high risk you have to take.