VPN protocols are mainstream and widely used by business people, but not VPN providers (using the term in the article headline) - that is, an ISP that instead of being accessed by its customers over phone lines, DSL links, or cables, is instead accessed by customers via a VPN protocol over the Internet.
Business people use VPNs to access their office networks. You don't need a VPN provider to do that. Business people generally wouldn't have much of a use for VPN providers - the only use I can think of off the top of my head is for testing connectivity, which is something your business's technical team might do, and which is an application where such a service constitutes massive over-engineering.
Otherwise... VPN providers are generally useful when you have to disguise your IP address for some reason. I guess they're also possibly useful (I've never used one so I don't know how well this would work) if you need an additional IP address, for running a server or something similar. The latter is obviously legitimate. The former may or may not be, but the immediate reasons for hiding your real IP address that come to mind are not legal.