This is self-hosted, so probably easier to apply security through obscurity.
I don’t know. The internet had hundreds of file sharing sites at one point. They all suffered fates similar to the epic MegaUpload although with not as colorful founders as Kim DotCom.
I don’t see how having them again would be different than last time?
Well it doesn't matter as much in this case because "Send" is a temporary file host.