Interesting. I had not known that. I tested it in Firefox and Chrome. While they both display a spoofed URL in the status bar when hovered, they differ if you right-click the link. In Chrome, nothing changes. In Firefox the status bar string changes to the actual, not spoofed URL.
At least in Firefox, one can check easily what the actual URL is before clicking without having to copy-paste elsewhere.
It seems to rewrite the link when it gets a mousedown event. Once I right-click, or if I left-click and then drag (to avoid an actual page navigation), the new hovered URL is the google.com/<tracking> version.
Also this only seems to apply to search ads/promoted results. Organic search results don't get rewritten, and copying and pasting a link address gives me the expected destination URL.
At least in Firefox, one can check easily what the actual URL is before clicking without having to copy-paste elsewhere.