Advertising is not just expensive, it's still not effective. For example, advertising on TV. It is the most expensive but has long become less effective
television advertising is the most expensive and the most effective, it has long been a proven fact.
Now very few people are watching TV, because it's easier to read everything on the Internet, but advertising is yes, it's very expensive
I heard that advertising in social networks is gaining momentum, but because of this project CPA does not lose its relevance.