50-60% would violate most if not all usury laws, unless you are a bank. Even in my state the usury is capped at 18%, so to even charge 20% you have to be a bank or its an illegal loan.
>Usury laws typically apply to consumers, not loans to businesses.
That may be a fair characterization, but its definitely a jurisdictional issue state to state. I know some States for sure exempt commercial loans, others exempt loans over certain amounts, and some exempt loans to certain businesses by industry (but not a outright exemption on commercial loans).
Obviously Stripe has a good public image, but unfortunately with SV unicorns like Uber, AirBnB, CoinBase (almost any cryptocoin/blockchain start up), its not unfair to say we should just assume business practice comply with the law.
Comparatively, 20% APR isn't so bad.