Pictalio is a place where you can upload and download stories (which are videos in portrait mode), you can find many stories in different topics.
Yes you can, it's completely free.
Yes, the Pictalio license allows you to use the stories for both personal and commercial purpose.
Check the Pictalio License for detailed explanation of what you can do.
Yes you can, as long as it doesn't infringe any moral rights regarding the content and its author.