And what about playing online games like LOL or Wow? This is online playing and having fun together. With online gambling the story is the same, you can sit in the close you wish, take a drink you like and totally chill. Isn't that fun?
For the gamers it might be fun because they are doing it professionally or as a hobby but mostly professional players are the ones betted on. Next they are competing and so they are having an adrenaline rush playing it as well. Its tough if you get under pressure but most players handle that.
But its not same for the gambler. Those who are betting on eSports know what they are doing and how each match is going to be fixed. Trust me all those eSports games are not fixed many end up with luck but most of the time they get fixed and both teams are paid to play.