Mainstream forums complain about big influx of amazon and youtube results diluting their serps. I don't see amazon but I did notice some awkward youtube results for "borderline" porn queries.
Funnily enough, it's not big youtube channels that pop in, it's stupid shit with keywords in the title, without comments, without description and with barely any views.
Which means that youtube got it's seo score manually boosted and it's able to jump ahead many sites that actually have backlinks and such for the searched term
