People would use it to block all the spam sites that host copious amounts of (potentially Google's) Ads/Analytics, and since they might actually start finding w

People would use it to block all the spam sites that host copious amounts of (potentially Google's) Ads/Analytics, and since they might actually start finding what they're looking for this will reduce engagement on the search results page and with the sponsored links. This is bad for Google's bottom-line thus why such a feature was removed and will never be coming back.