I've found that marketing strategies and tactics can be broken down into three main categories: Owned, Rented, and Borrowed. In other words, you have lines of communication to an audience that you either own, rent, or borrow.
I'm spending $2,287.50 to advertise Everything Is Marketing on podcast apps Overcast, Podcast Addict, PodBay, and PodNews to grow listenership for the show.
Dropbox pinpoints a single common use case to build interest for their Business product. It's easy to dilute your ad to appeal to a larger audience, especially when you're at Dropbox's size, which is why this ad is respectable.