EDIT: I was wrong, they've already charged and settled with two: TmarTn and Syndicate[2].
[1] https://www.ftc.gov/news-events/press-releases/2017/04/ftc-s...
[2] https://www.ftc.gov/news-events/press-releases/2017/09/csgo-...
1) CSGO Lotto was never a gambling site to begin with because you could play for free simply by emailing support, akin to McDonalds Monopoly [0]
2) It was public knowledge that the owners of the corporation were TmarTn and Syndicate.
[0] www.polygon.com/platform/amp/2017/12/18/16782124/csgo-lotto-lawsuit-gambling-terms-of-use-tmartn
So was the argument here that they expected children and teenagers who were primarily consuming their content to look up the public ownership records of CSGO Lotto? Since they weren't particularly open about their ownership in the videos that they advertised the site in.
Regarding the platforms, how are they supposed to know if the uploader got paid to do a video? If it was obvious, we wouldn't need these disclosures in the first place!