In the early 90s my father got into some tax problems that were of no fault of his own. He started getting into tax protester non-sense as a means to get out of the problems. Newsflash - it doesn't work. I would say this was the birthplace of the QAnon phenomena.
This the naturally lead into the whole New World Order conspiracy theory. I remember my father actually talking about it with householders out in the door-to-door ministry. He even had maps of where the concentration camps were being built in the U.S. It got to the point that there was a special meeting on a non-meeting night involving the elders, Witnesses who brought what my father was talking about to the elders, and my father. The elders made the dry-snitches repeat their claims to my father's face for him to either confirm or deny. In the end, nothing happened.
From their it just continued. I remember around 2008 he spoke of Canada, the U.S., and Mexico all becoming one country, The Union of North America. The evidence was this new currency called the "Amero". He showed YouTube videos supporting this. Turns out, it was just the brainchild of Daniel Carr, a coin designer, and were just for fun.
The things about all my father's conspiracy theories was that there was always a steady number of JWs in the congregation that were diehard followers of whatever he was saying. So, it doesn't surprise me in the least that JWs fall for this QAnon stuff. Any straw that they can grasp that backs the Watchtower's claim that we are in the "last days" is going to get JW support.