I seem streaming site , and download video site got adsense ad , the funny thing they don't have content yet managed to display adsense ads.
I guess they might have one domain got contents , than the rest of the site they just submit to approve usually quite fast within the day those site will have adsense ads.
Because I used to have one main site before , approve for adsense , than I got another sub domain done by one guy I buy his service, which I have mention few times here just a twitter app let twitter users check how much their twitter account worth.
on this sub domain only one page , and yes top, bottom , got adsense ad.
Amazing come earnings very fast is that sub domain , the twitter app compare with the main site .
the main site earning just few cents but the sub domain can go to 50+ , highest is 70++ per day before twitter ban my API for it .
Thus no doubt I can sure those site streaming ones and those kind of site can download videos one with adsense ad are earning a lot and fast than a traditional blog site with contents .
I believe one day Google side will ban those site having adsense ad stop serving ad but I not sure , maybe take long or very fast , depend your luck