What are you talking about? https://www.msnbc.com/opinion/msnbc-opinion/bernie-sanders-kamala-harris-vote-israel-gaza-rcna177851
He very explicitly and clearly denounced Israel’s actions and called out exactly what is happening. He endorsed Kamala despite having different views on the issue, not because of it.
The other replies are incorrect, the lower tier premium actually has no ads on most videos. When you subscribe, they explicitly let you know music videos will play ads, probably so this plan is not eating away profits of YouTube music.