> 5.2 Scope of Processing. > 5.2.1 Customer’s Instructions. By entering into this Data Processing Amendment, > Customer instructs Google to process Customer Personal Data only in accordance > with applicable law: (a) to provide the Services and related technical support; (b) as > further specified via Customer’s use of the Services (including the Admin Console > and other functionality of the Services) and related technical support; (c) as > documented in the form of the applicable Agreement, including this Data Processing > Amendment; and (d) as further documented in any other written instructions given > by Customer and acknowledged by Google as constituting instructions for purposes > of this Data Processing Amendment.
So no, they probably can't track and feed that into youtube ads, because it is not a cause that provides the service or support.
Afaik Google announced last year that they stopped processing GSuite account emails to a large degree.