Privacy-wise, it enables them to track the result you click on.
Also, though more niche, it would make archived search result pages (e.g. on the Wayback Machine) less useful.
I think they always knew what link you clicked on (when most of the web has a ga4 tag on the other side of the link)
I think they always knew what link you clicked on (when most of the web has a ga4 tag on the other side of the link)