So you finally got here!
What you’ve just experienced is a URL shortener used in conjunction with an intermediate page where you would typically see ads.
Most of the time you wouldn’t want to give your customers that sort of experience but there can be situations when using URL shorteners with ads can work fine. For example. if you have a vast quantity of visitors that you really need to monetise in some way, an ad-based URL shortener can help.
I’ve listed some below that are monetised in this way although I am not making any recommendations. If you use these URL shorteners you can make some money every time someone see an ad on the way from your shortened URL to your real web page.
LinkShrink
Adf.ly (this one looks interesting)