QAnon is irrelevant aside from the attention they are getting from their supposed political enemies. You seem to need an image of an enemy. Same with flat earthers. They existed 20 years ago and they were completely irrelevant. Antivax had a lot of people joining because they had partly reasonable objections or trust issues towards official sources and some hobby Don Quijotes with a slight inferiority complex needed to prove themselves by demonizing these groups as if they were the devil. As expected, these groups didn't shrink.