I will fight anyone who tries to tell me that a auto-playing video with sound enabled is not just as annoying as a small static image on the side of a page. Even when I'm somewhere with a limited internet connection. [sarcasm]
Firefox, for example, used several different marketing avenues including a newspaper ad to try to make people aware of them. As far as I recall, that was all they were trying to do, let people know another browser option was out there. It seems a stretch to consider that as trying to manipulate your thinking.
That's completely opinionated ad and not just a notice that this product exists. I'm not going to stare at this stuff all day. You feel free.