Why do we do that on youtube when we don't do that on TV? Do we assume that if you're ad runs during <some sitcom> you agree with the jokes in it?
TV just has also built up years of trust with advertisers and have legal departments reviewing all their content while YouTube was throwing up ads in front of ISIS recruitment videos.
Nobody is complaining that ISIS is losing their youtube ad revenue stream, that's a strawman argument. ISIS recruitment videos violate youtube's guidelines so they'd just be taken down, that's not what we're talking about here. What's actually happening is videos that have a dissenting or unpopular viewpoint have their ads removed, with a lot of harmless content caught in the crossfire due to the indiscriminate nature of youtube's algorithms.
Also, the FCC regulates broadcast TV and commercials. you can't simply run an obscene advertisement just because the station and/or station's audience approves it.
Our society does do that on TV and radio. Consider the recent boycott attempts against Laura Ingraham: https://en.wikipedia.org/wiki/Boycott_in_support_of_David_Ho...
>Do we assume that if you're ad runs during <some sitcom> you agree with the jokes in it?
I don't think most people actually assume that the advertiser literally agrees with all the content they are running ads on. Rather, I think that people have found that it's an effective ideological weapon.
Going after the advertisers to attack content is a tactic that works. The attackers don't have to literally think that the advertisers are morally signing on with the content, they just have to think that enough people out there think that, and that the advertisers are risk-averse to bend the knee, that it's a useful tactic.