I'll try to explain my idea,but I still have much to learn in terms of English. I'm typing from Brazil and I've been thinking about using educational advertising before starting the videos on youtube instead of shopping like "buy this new product! It's excellent!". There are many videos that focus on the violence against black people, old people and others. So how could I choose the advertising that will be shown before the main video starts?
For example: If I help an organization that fight against the bullying at schools I'd like to watch a video that shows what the government in the USA does to help their students.

Here we are forced to watch, at least, 5 seconds of the new add of Coke, Adidas, Nike... I'd like to choose these "previous videos". Maybe if I could make a link with another video on youtube would be great! Thank you for your support :-)