It's not riskier first off, it's less risky, by far. Bitcoin is cash, it can't be charged back and it doesn't incur the fees cards do. To say it's riskier shows you don't know what you're talking about.
Secondly, why would a business turn down any means by which a customer wants to pay? Have you ever run a business? Do you typically turn down cash payments? Bitcoin is cash.
I see you've never run a small business that accepts credit cards before. They are far more than 0 risk.