I always wonder what's the difference between paid and free VPNs. The most readily possible reason I can think of is the no. of servers/routers between us and the website. For all we know paid vpn service may just be: me <--> Paid VPN server <--> website. I'm don't have a technical background and wonder how can we tell how secure a particular VPN service is? I hope someone here can enlighten me. Thanks a lot (in advance)!