In the split events, you can choose to listen to specific links clicked.
Here you are only able to choose static links.. Like if you type in www.google.com as the URL.
Lets say you want to send out an email where you insert an URL from a CRM field on the contact.
The URL would be different from recipient to recipient.
We can not listen to that click action. So we are unable to listen to a click event on a dynamics URL.