The principle is simple you upload a movie, choose the date when it should be available and put in  the email  addresses to which the video is to be delivered. you can use it , for example, to send your videos to (grand)children for their 15/16/18/21st birthday or sending wishes for the future (never to forget an anniversary)  :-)

The service is paid because there are no ads and there is no data harvesting. Of course, I understand that “you can record and  keep yourself" but thumbdrives get lost and computers crash and we use the Amazon servers.