That money means that Firefox and Safari won't ship ad blocking by default because as soon as they do it, their users are worthless to Google, and Google will stop paying. It also means that their tracking prevention doesn't affect usage of first party cookies on other sites, increasing Google's and Facebook's advertising dominance.
Blocking AdWords — sponsored search results — is very different from blocking display ads. I would be surprised if most users found that sort of blocking desirable in the first place. Some might, and I would not be surprised if it were an option, but also very surprised if proportion of Firefox users blocking AdWords ever approached even 50%. Anyone who doesn’t block is still valuable to Google.
