It's not really a new phenomena. Look back in the 70s or 80s with arcades, people would stand around watching their friends play. Then later young people went to each others houses and played video games (mostly multiplayer but some single player and watched).
It's entertaining watching how other people do things. They might play differently than how you would play it.
It's entertaining watching how other people do things. They might play differently than how you would play it.