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Marketing is not the same as advertisement, though.

There's a lot more to it than that.

Advertising is a subset of marketing.

So many people still don't get this.

I guess they need better marketing

They don't. A few years back, clever SV marketers renamed marketing "growth hacking" and everybody's been swallowing it whole ever since.

I'm yet to hear the term "growth hacking" used outside of a joke.

Googling for "growth hacking" will show you a few (thousand) examples.