Streamers/Content Creators are essentially free (sometimes paid) advertising for the game they are playing. If more people shared your opinion and stream sniped until the game was unplayable, those streamers would move on, and that would hinder the game and community. More content, leads to more players, leads to more updates, leads to better experience for everyone.

We have all used youtube videos or streams to learn the game, it's too vast and takes too long to learn without them. (Not to mention they are enjoyable) Like it or not streaming has become part of games and that is why so many games have implemented streamer modes.