Counter Strike 1.6 continues having an active community of players, although the game is older and less popular than the newer versions of Counter Strike like CS:GO ( Counter Strike: Global Offensive).
Many fans of CS 1.6 stay true to this version because of nostalgia, preferences of gameplay or avoiding changes in newer versions. So, yes people still playing CS 1.6, but the community can be smaller than the newer versions of the game.
Counter Strike was extremely popular in the Gaming Clubs or (Internet Cafes) in the earlier years after its release in 1999 and continues to be played in this context in some regions.
The Game Clubs provide a place where many people can meet up and play together on a Local Network (LAN) which adds to the social aspect of the game.
One of the reasons for popularity of Counter Strike in the Gaming Clubs was that it could be played with relatively low hardware requirements making it accessible to a wider audience. Except that the gameplay focuses on team play and strategy which further encourages players to communicate and cooperate. Despite the appearance of newer versions like CS:GO, Counter Strike 1.6 continues to have its community and popularity in some Gaming Clubs and among lovers of the classic version of the game.
Another thing which helps Counter Strike 1.6 to stick around is that the content creators are much more developed and they create so many modifications about this game like maps, plugins, models etc.