Believe it or not, Farnsworth, (inventor of the principles making Television possible) had no intention of it being used as an advertising or propaganda tool when setting out to figure out the problem. That's very much a "what people decided to do with it" thing. Bored farmer figures out thing, industry does horrible things with it is a tale as old as time.
It was supposed to be for recording and playing back images. That was pretty much it. His original aspiration was for it to be employed in educational contexts to help make tge spread of visual information possible.
Now if you're talking TV Broadcasting as an industry, then you're absolutely correct. That was the business model settled on, but not without some foundational hmmm'ing, haww'ing and experimentation in coming up with business models in the radio broadcasting space. The history is in itself an interesting piece of work to dive into.
