Some of the preprint servers like arXiv have moderation. Others like viXra don't have any form of them. I browsed authorea.com and I think they don't have any sort of moderation like viXra. Am I right?
I asked this question on their help chat. This is the answer that I received
Authorea preprints go through a basic screening (only content scholarly in nature is accepted in the repository).
So, you seem to be wrong. There is moderation, although it seems to be lax in nature. So, I probably think that your paper will get through it. Authorea seems to be very new though. I checked it out thanks to you. It seems to be some combination of overleaf and arXiv.