Warzone pros use a VPN for one of two main reasons or a combination of the both.
VPN software such as the Sbmmoff VPN forces players into a connection orientated game instead of a purely skilled based match making game.
This type of Warzone VPN routes only the match making portion of your games traffic over the VPN tunnel (connection).
By only routing this specific part of the traffic over the VPN tunnel, your actual game packets remain totally untouched and pass over your internet connection as if there were no VPN envolved anywhere along the process.
This method allows Warzone Pros and other like minded gamers to be able to connect to a whole range of countries around the world whilst keeping a super low ping.
Having a very low and stable ping is a key part of gaining an extra edge and this method allows warzone pros to make sure that they are getting a low ping game at all times.
Another reason that Warzone Pros like to use VPN software such as the Sbmmoff Warzone VPN is in order to get into easier lobbies.
Skill based match making uses a whole range of data including your geo location displayed in your network settings in game and the perceived distance you are located from the physical location of the Warzone / Call Of Duty server that you are playing on.
In conjunction with this data various other data sets such as your average kill to death ratio and that of other members in your party are taken into consideration.
By using a VPN such as the Sbmmoff Warzone VPN you are able to make the game assume that you are infact playing from a destination located a very far distance from the server you are playing on and this forces the skill based match making system to put you into a game as quick as possible due to this factor.
Sbmmoff VPN:
This can result in getting into easier lobbies and is a tried and tested side effect of using special Warzone VPN software like the Sbmmoff VPN which is specifically designed for Call Of Duty Games such as Warzone and Modern Warfare 2.
So in short, Warzone Pros use a VPN to get the best ping possible in game or / and to get into easier lobbies and play in more of a connection based lobby rather than a purely skill based match making lobby.