I think that online multiplayer games does not need to exist as most games could be played offline with AI and with higher enjoyment also.
I think the reason a lot of people don’t enjoy AI offline instead of multiplayer games is because as a capitalist society we associate multiplayer games with higher joy, due to the huge amount of ads and streamers targeting teenagers to show them how much fun they are missing by not playing in online multiplayer games. I had met a variety of people with different ages and a lot of the older generations prefer offline games and consider it the norm.
I used to play all kinds of FPS games online and loved it because people in each match would play differently. I always kept my mic/voice chat off because I didn’t want to listed to 13 year olds screetching or 30 year olds yelling at their kids. You can’t replicate this with AI because developers only do so much work with this stuff and you start to notice patterns and repetitive behavior from them after so long. With real people you might sometimes get your ass whooped while other times your team winds up camping the enemy spawns and cleaning the floor with them.