I'm not a fanfic writer or anything but I just want to put this out there. (It's my personal opinion on the matter.)
As someone that has seen EYK videos since 2010, I feel sad that so many fanfic writers would consider them to be "horrible" people. If they want to talk about fanfiction on one of their videos does that make them horrible? I think not. But apparently a lot of the fanfic community find the idea horrifying. I have been watching them for four years and have never seen them purposefully try and harm any of the idol groups they have reviewed, except if you count expressing their honest opinions a threat to a group. To be honest they have always been funny, open-minded and just great people.
But I do understand that some fanfic writers want readers to ask for their permission to submit their fics to EYK or do not want their writing to be on a EYK video at all. That is their rights and I comprehend them, but a more mature approach would probably be more helpful then describing people they don't know or haven't even seen a video of as "horrible".
That was just my opinion. And yes, I know that not all fanfic writers are so prejudice as to make EYK bad people in their eyes because of a tumblr post, and I appreciate them for being so mature about it.