4 best upload to get paid sites

We all download all kind of stuff from the internet and most of us upload all kind of stuff to share with friends or all other people, we are doing it constantly and daily, so why shouldn't we get paid for doing this? I found 4 best websites which allow you to upload all kind of files and get paid for it when people download and of course there are millions of this sites, but most of them won't let you earn a penny.