They probably say "give me some ads for keyword 'react js'" and don't pass on your IP or other identifying info. Still a problem if you search for your own nam

They probably say "give me some ads for keyword 'react js'" and don't pass on your IP or other identifying info. Still a problem if you search for your own name, but I don't think you can do much about that. Or maybe MS provides a bloom table / index of all keywords they currenty have ads for, so you can check "offline" before sending it to them?