Yes, it's poorly defined. Some follow Qanon, and others follow them. The line is blurred. When a person who has wide influence (say, an ex-President or the news anchor on a major right-wing TV station) repeats untrue comments that seem to have originated with "Q", it is no longer clear-cut. Conspiracy theories are necessarily things that originate somewhere (frequently unknown) and then spread, perhaps through many generations, as "I heard that...". Not all of them got it straight from the source.
I'm sure I saw the rather florid description "a class of men given to a new and mischievous superstition" somewhere once, which is strangely fitting.