See depending on who you ask the answer is yes or no.
Comicsgate as a "thing" was probably started by him. A guy complaining comics changed and are now unrecognizable. That ladies were no longer super hot bitches in leotards infuriated him. So he took to online insulting these comics. For every genuine criticism he had he would also accuse creators of being mentally ill, pedophiles, probably rapists, diseased, suck dick for a job and of course rip up comics.
Add in some controversy about milkshakes. Some pros yelling back at him and you've got a movement. Zack showed relentlessly calling people insulting things online gets their attention and MANY people started to do it too!
Now Comicsgate as a "Brand" is more EVS kind of thing. Where he says it isn't a brand but names his stream that, designs a logo for a fake company called Comicsgate and tells people to use it. Now some argue he did this so VoxDay actual white supremacist and ruiner of many things didn't BUY the brand like he wanted to. But others say Ethan did it because he likes to be king fuck of shit castle.
Zack like never had MUCH to do with these guys. He never went on many of their shows, never spoke to them and none of them ever helped him out or fixed his comic (which is shit). When Zack went to sue Mark Waid Ethan did a "RAISE FUNDS FOR ZACK" thing and nobody is sure if he ever got those or not...
But no they claim he's not a part of Comicsgate. If that like him NUKING his twitter, deleting is old roast video and rebranding is channel is all part of helping him sue Waid or indeed NONE OF THEM LIKE HIM and don't want him around is up for debate.
All in all it's very fucking stupid and it's either an incredible trashfire or the sad states of a lot of people's dying and guttering careers in an industry where they were either big names of thought they were. Most of the big names in comicsgate are youtubers who have never made a single comic thinking they can do better.