It used to slowly drive haters insane, hence mad haters. There was a theory Napoleon was exposed to excess levels of Arsenic over time although that might have well been background exposure. Nevertheless over time it’s not good for you. Neither is lead.
Do you think there is information YouTube wouldn’t collect about you even if they could be better at selling ads to people based on it?
Do you live somewhere with data protection laws? If so you could request a dump of all personally identifying data they hold on you.