I'm writing to anyone responsible for Youtube or related to Youtube who happens to read this.
I will never allow you to interrupt my videos with advertising, and the reason is simple: The overwhelming majority of these advertisements have the purpose of deceiving me pure and simple, of trying to sell me things that aren't worth shit. And I don't need to mention the many advertisements which are effectively malware trying to get me to install viruses or steal my money.
And before you go off shouting that advertising is necessary to keep the site running, do you know which advertisements work? It's the videos of content producers actually using the products in their work, like some who restore old things and use tools and products that actually would be useful to others, rather than yet another advertisement for yet another "freemium" shitty game.