Imagine a brand sends out 1,000 emails with a regular link. They know how many opened the email, but they don’t know exactly who clicked the download button. With Bitly, they know precisely how many people "unlocked" the exclusive offer. If the 4frp link gets 150 clicks, the campaign was 15% effective.
Here is the report regarding the likely nature of the link (or similar variations). bitly 4frpunlock exclusive