QAnon: Two reasons it might originate from, and be believed by, people with multiple personality

First, it includes speculation about a satanic cult conspiracy, which had been a widespread fantasy in the past among people with multiple personality:

https://en.wikipedia.org/wiki/QAnon

https://en.wikipedia.org/wiki/Satanic_ritual_abuse

https://pubmed.ncbi.nlm.nih.gov/7960286/ 

Second, as I have often mentioned in past posts: anonymity, namelessness, is very common among alternate personalities.