No URLs have ever been deleted, but this may change in the future to recycle codes that have never been used or have not been used for a very long time.
No, not at this time.
No, not at this time.
No, not at this time.
No.
No. You should assume that any URL submitted can be viewed by anyone. While there isn't a page where someone can view all URLs that have been submitted, there is nothing stopping someone from entering random digits to view random URLs. Viewing random URLs is difficult on traditional URL shorteners because most use a mixture of all upper-case letters, lower-case letters, and numbers. This URL shortener uses only numbers, which means it's much easier to guess a valid short URL.
Elias Saba, the same person who made the Downloader App and AFTVnews.com