The success of services like WeTransfer or Dropbox is that it is dead simple to use. It does one thing (sharing files) and makes this as easy as possible.

Seafile seems to be easy enough, yet still has a multitude of features compared to YouTransfer. OwnCloud simply has a whole different goal. It's not about sharing files, it is about organising your entire cloud presence (with e-mail, calendar, foto's, etc).

With YouTransfer, you can have the same ease-of-use but on your own terms. It runs on your own servers, with your own (secure) storage. You are in full control.

Given that it is also published as an NPM package, YouTransfer can be modified to suit your specific needs. This makes it interesting for companies to rebrand it and use it as their file-sharing system.