It's because for the first time in modern memory, the militant left were beaten back. When they made their move to take over and destroy the industry, the people fought back and won.
The events showed how they had infiltrated every major sector of the media and entertainment industries, and almost everything else, and the tactics they employ to infect and control. When GG fought back, they lost their minds. They doubled down and fought even harder, getting more extreme, thus exposing themselves even further. That exposition made more people realize that absolutely none of their hobbies were safe from left-wing gentrification. Any game, fandom, genre, format, medium, tech, industry, faith, they would stop at nothing and the record proves it.
Games went crazy, then fantasy and sci-fi literature blew up, then comics blew up, then cartoons. It wasn't even really sequential, it all kind of happened at once because these people are all connected to each other in one way or another. When one clique started losing ground, members in other cliques redoubled their efforts to maintain control or push from their end.
This all bled into politics. The Democrats do the exact same thing that the media and all the aGGro journalists and "influencers" did to us. The media gives them full control, manipulate everything in their favor, and they both lie and do everything they can to demonize and smear anyone who didn't fall in line with them.
GamerGate may not have had a direct influence, but it was the start of a huge push back. It made other people like us wake up to see what's happening all around us. It's not just entertainment, nothing is safe, but we can fight back. GG proved that they can be beaten, that if you fight back in the right way, they will expose themselves.
And they have. Remember Ferguson and the start of BLM and Antifa? Look at the mugshots of the rioters that keep getting arrested (and released without bail). They're the exact same people that screamed GG was Satan. This is all the same long, ongoing hissy fit. And things have escalated, onlookers have seen their actions for what they really are.
So again, GG didn't have a direct influence, but it was the spark that started the blaze. Bringing it up again is just them revisiting their burnt ruins to fan that last remaining ember, all while they keep setting more fires and blame the flames for burning everything.