It’s a 20% APR only if you’re paying it back really quickly - and if you’re generating so much revenue that you’re going to pay it back quickly why would you need the money at all?

For businesses that expect a slow payback, the APR isn’t nearly that much.

I’d use it to reserve EC2 instances, for example. I get a 40% cost reduction on AWS over 3 years, and I’d expect to take that long to pay back the capital. The APR would be fine in that case, and I make 20% more than I would otherwise.