Comment by fuzzylightbulb

IANAL, but it seems pretty cut and dry to me: either Twitter served up an ad next to the objectional content or it didn't. A number of the named advertisers claim to have zero tolerance policies when it comes to their brand being placed adjacent to antisemitic content, and so even one misplaced ad should and would be enough to cause an exodus under that policy. At the end of the day twitter and its algorithms control what ads get served regardless of how abnormal the user behavior was that triggered the algorithm to do what it did. Ultimately it's an engineering failure on twitter's part.