Breitbart is more influential than Youtube for elections.
Youtube is just a bunch of ignorant programmers who make millions and scold people like teenagers. I know a few who work there and acknowledge their genius and their huge inferiority complexes. Just like spoiled Hollywood celebrities. Spoiled, bossy and powerless.
You are whistling past the graveyard. A large segment of the under 30 population spends a great deal of their day on youtube. This attack will have real consequences for 2020.
That is why they did it.