I don't think people who have BTC are taking a Bitcoin backed loan for consumptive purposes. They offer a high borrowing cap of $6.2M, so this service is probably intended to target high net worth individuals or companies. So it's more likely for productive purposes, like business capital or to reinvest.
Companies and businesses will stay away from this, the contract terms are for 1 year, no business in Japan makes decisions for such a short time.
They would just go to a bank, access a 5-year loan at way lower rates than what they offer.
Also, a lot of people are mistaking what this service is addressed at, this is not some OFC deal :
Eligible users
Applicants must be between 18 and 70 years old and have a stable income (meeting our company's criteria). Part-time workers, freelancers, and self-employed individuals are also eligible.
*The actual interest rate will be determined by the credit check and will range from 3.5% to 7.0% per annum.
This is for individuals who want quick cash but don't want to sell their coins, nothing more.