You don't know if they use your queries to further track/predict your online behavior. It's impossible for you to know this. You certainly do know that you are

You don't know if they use your queries to further track/predict your online behavior. It's impossible for you to know this. You certainly do know that you are giving the DNS queries to them (that's a fact). IMO, it is reasonable to assume that an advertising company would use data (that consumers give them) to further enhance and target ads to those consumers.