Pi-hole does not block content that is hosted on the same source as the ads. Youtube, hulu and friends host their own ad services (dont quote me on exactly which streaming platforms this does and does not work on, uBlock should also be part of this suite of ad-blocking) so it wont spare you from those. However people using ad services like google adsense on their website will have content blocked as DNS will resolve to the place your trying to go and the webpage asyn-loading its ads will not.