There is a subtle, but important, difference between letting people know your product exists or improved, and brainwashing people into buying your product.

Is a grocery saleman at the local saturday market allowed to shout about the sale he is doing on strawberries? Because that is also marketing.

I fully agree that the average advertisement you see on youtube is pure cancer. But what about an advertisement for an emergency fund for a disaster?

What about a sponsored video of a game?

Where do you draw the line?