And if you are one of those advertisers, how "common" a problem does this have to be to make you think you don't want to advertise there anymore? Even X's filing doesn't claim this "can't happen", just that it doesn't happen frequently.
For CMOs making major ad buys for carefully curated marquis brands like Apple, IBM, et al, I suspect that the only concrete number that they want to be assured of by their advertising platform is "0".
0 is impossible and advertisers realize that, which is why large user-generated content companies set up a Trust and Safety team to rapidly respond to these issues to placate advertisers.
Too bad Elon fired Twitter/X's Trust and Safety team!
What could a "trust and safety" team even do when the site owner/CEO spends his time directly responding to racist diatribes with positive encouragement [0] ? Like you can't pass off the nastiness as just "some users" or otherwise exceptional when it's being directly nurtured by the forum admin. So the resulting question is more like when to stop advertising somewhere the admin seems intent on making into Stormfront Lite?
[0] https://nitter.net/elonmusk/status/1724908287471272299 . I'm including this link even though it's been referenced to death, because reading primary sources is important - especially with people people becoming desensitized to claims of racism from a media landscape that often takes things out of context and heavily paraphrases to blow them out of proportion, which is decidedly not what happened here.
For CMOs making major ad buys for carefully curated marquis brands like Apple, IBM, et al, I suspect that the only concrete number that they want to be assured of by their advertising platform is "0".