This question is hard to answer because new teams are constantly arising, and old ones are disappearing. In addition, professional athletes can move from one squad to another, and sometimes they do not take part in several seasons to be reborn from the ashes later. In total, we can say that there are about 500 СS2 esports teams that constantly show themselves at tournaments. The total number of professional cyber athletes in СS2 is about 1.5 million.