The latest prediction from the QAnon movement seems to echo that of the sovereign citizen movement, whose followers believe they do not have to follow federal laws or pay taxes.
The basis of this comes from a law they believe passed in 1871 which secretly turned the U.S. into a corporation. The sovereign citizen movement, therefore, believes that every president after Ulysses S. Grant is illegitimate.
They also claim the U.S. has been run by a group of shadowy investors since 1933, when Franklin D. Roosevelt ended the gold standard. The date of presidential inaugurations was also changed from March 4 to January 20 in 1933.
As noted by the Southern Poverty Law Center (SPLC), sovereign citizens provide officials with “hundreds of pages of pseudo-legal nonsense” to help back their claims if they are implicated in a legal case.