You'd be surprised at how much "borrowing" happens online, especially when it comes to fan theories in general.
One person will come up with an idea...the next thing you know, it's shared around the bend and back, like a game of telephone. Just look at "theorist" YouTubers / icons like the SuperCarlinBrothers, JonTron, and Jon Negroni ("the Pixar Theory"). The Carlin Brothers tend to rack up hundreds of thousands of views for almost every theory video they do.
For another example, there was a guy on YouTube (The Theorizer) who decided to do a "master theory" on the movie Coraline (video #1 of 6 can be seen here). Then, after he started blogging about it, a ton of other YouTubers started blogging about the same thing, which he noted in his most recent video here.
On /r/fantheories, it's not just me that Buzzfeed-style sites have been "borrowing" content from. MoviePilot and other cinema-related "Buzzfeed-style" sites are consistent and notorious for doing this. In 2014, Reddit even made an attempt to try and curb this sort of behavior by changing the site's "press etiquette".
> If you see an interesting story or photo on Reddit, message the redditor who shared the piece to ask for their permission prior to using it in an article or list, ask how they would like it to be attributed, and provide them a deadline before you move on to another story. Please respect redditors who may wish to stay anonymous, or to not be featured in an article.
And front line of the article even states:
> Reddit rolled out some rules on Tuesday targeting "viral" websites like BuzzFeed that traffic in listicles and other material plundered (i.e. stole / "borrowed") from Reddit users' posts. (Source)
> it's feasible that a book could be written in 6 months, but edited, printed, and released in 6 months? Unlikely.
You can literally type up a novel in less than a month and publish it to an eBook site / program, such as Amazon Kindle. Speaking of Amazon, they also introduced Amazon Worlds, where people can literally sell fanfiction, most of which tends to be written rather quickly (and sloppily):
> According to Amazon’s statement today, Kindle Worlds is "a place for you to publish fan fiction… engage an audience of readers, and earn royalties." The small print being that your fanfiction must be set in "featured Worlds", which currently include Warner Bros. shows Gossip Girl, Pretty Little Liars, and The Vampire Diaries. So people looking to profit from their Harry Potter or Teen Wolf opus may have to wait a little while longer.
> The deal is that writers will receive a 35% royalty for stories of over 10,000 words, or 20% for <10,000 word fanfics. (Source)
I posted this in another reply above, but I'll share it here as well.
As an example, NaNoWriMo is all about writing a 40,000+ word book in one month. The whole point of the site is "write a novel in a month". With that timeframe, you could write 6 novels in 6 months.
Hell, I've seen fanfictions much larger than that be written in less than the span of 2 months. The "you can't write and publish a book in six months" claim I've seen others saying is a very common misconception / assumption.
To top it off further, one of the titles on my shelf is literally <em>Is Life Like This? A Guide to Writing Your First Novel in Six Months</em> by John Dufesne.