The VPN market moves seriously fast. In a short space of time, a VPN provider may significantly expand its server network, completely change its privacy policy, or add a whole host of shiny new features.
Of course, not all developments are for the better, and one VPN improving its offering can be to the detriment of others that fall in the pecking order as a result. The constant state of flux is a reason why we test (and retest) VPNs on a regular basis.
