Woah I just discovered that, it is not that bad that they do that for scraping but what is worse is that it deceptively allows to track user click in a way that is unexpected by them.

It really change the url the moment you click on it, but it is so fast and subtle that you see nothing. But you can see it more clearly by doing a right click, like when you want to "copy the link". Just doing right click, you will see in the status bar the link url changed and it will stay to the google redirect server as target. That sucks hard!