Among all those theories here I have my own.
Fujiwater is tripping balls, spewing bullshit and have one helluva laugh reading all of it. Or he's a genius and it will come together in chapter 59330.
Are catgirls furry tho?
Maybe as a gateway drug to it? Like one day you are like "Hey, Holo is pretty cool" and some time later you furiously jackin' it to morally and legally dubious DeviantArt accounts.