When you add a new campaign on Google or Microsoft Ads you may forget that you have account level keywords. And some of those keywords may not be appropriate for the new campaign. A checklist when creating new campaigns can help.
The bottom line is that negatives at the the account level is definitely worth using because of all the reasons stated above. But it is worth it to check from time to time to make sure the negative keywords are still appropriate for all the campaigns
Adding a negative keyword on an account level to Google Ads
How do you add negative keywords on an account level?
The picture above is for reference.
1. Go to Tools and Settings on the Google Ads header
2. Under “Shared Library” click on Negative keyword lists