I wouldn't include their pricing structure as part of their marketing, though it doubtless attracts many users. (So do their algorithms, but those aren't includ

I wouldn't include their pricing structure as part of their marketing, though it doubtless attracts many users. (So do their algorithms, but those aren't included in their marketing, either.) And insofar as they have a reputation for giving away their services for free, that's a part of their heroic image.