I did read the TOS, but I have cookies disabled so it still said NO. I suspect that most of the people who do read the TOS probably also have cookies disabled, and therefore also were not counted.
I read the TOS too. I have first party cookies enabled, but I also said no to agreeing to include my data in the dataset. I suspect there's a selection bias of one kind of other in the TOS piece. Probably correlates with other fields too!