Using VPNs

How many people actually use a VPN when out at cafes and free wifi hotspots?

I read lately so many people starting to use VPN’s but some people said make sure you read the details like data usage and server locations etc…

No idea how many people as a % are using! ISPs might have these stats. But there is a detailed section on VPNs on volume 3 if you want to know more about them.