Gamergate didn't ruin the gaming industry, it was already ruined, all Gamergate did was give other forms of media; films, TV shows, music, comic books, the green light to pursue a new audience; the crybaby.
Rage quitting was very rare back in the days of early online multiplayer and wasn't an issue until devs began to change their online systems to encourage and aid rage quitting. When online games began punishing the 'victims' of rage quitting; either though forcing the remaining player to stay or lose stats, or through punishing a team who now have one less person on their team.
This could have been handled easily by devs, but they didn't. What's worse is that they target camping and made it a legitimate tactic to sit in a corner and mow normies down. This only became a popular idea once vote to kick was removed. In CS 1.6, vote to kick was a popular way of removing unwanted players from a match, at least on the servers I played. This community power made lobbies and matches a more elite experience, as those who were going to camp or be generally bad at the game, would be booted.
Think what multiplayer would be like now with those persistent lobbies, vote to kick for the community to remove people blasting crap down the microphone, campers, team killers and scumbags. It would be glorious.
It doesn't exist though because the main audience isn't those who want a glorious game. The target audience is the cry babies who want everything fair, with their style of play protected over everything else.
I will go one further and say that those who enjoyed rage quitting to piss the other people off and those who camped and laughed when they were told not to, are the same people who spout "git gud" when you're critical over the repetitive, autistic, neckbeard-magnet that is the souls games.
When the crybaby tactics became common place and the crybabies knew that devs wouldn't stop them and even pondered to them, it opened the flood gates to narcissistic crybaby freaks.
Look at how the trannies and gay Lords conduct themselves online and in the media. They are cry babies and the industry should have gave them a taste of the back of its hand and told them "NO, join in or fuck off".