Why does this 30ish minute video have 10 ad slots? As cool as this is that he got this working, from my android phone I can't watch this without losing track of

Why does this 30ish minute video have 10 ad slots? As cool as this is that he got this working, from my android phone I can't watch this without losing track of what he's saying. (I know there are ways to block ads, but that's not the point)