The only interest that ever makes sense to say it's a good thing, is the amount you'll collect if you're a long term holder of Bitcoin. Loans never really make sense if you can avoid them. It's basically signing up to lose money, so that you can have something sooner. If I offered you a pizza today, but you'd have to overpay 2x the amount of what it's worth, instead of waiting to have it in a week, you'd probably not go for it.

The only exceptions are houses, and while it's technically still a loan, not many people can get houses without one, and much of the time they're needed to be able to work in certain places etc. However, I wouldn't be using my Bitcoin for securing a loan. To be honest, I'm highly sceptical of the companies that are offering this, wouldn't consider them trustworthy at all.