I question the limits of security in cloud services, but there's more to it than the technical aspects. There's a component of CYA for regulatory compliance. If you're a financial or medical company, you've got to demonstrate a good-faith effort to implement various thresholds of security to pass e.g. SOC audits, and this helps. Nothing is 100% secure. This is a component of an overall security plan. I don't want to overstate the benefit, but it's more than just PR.