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I'd use a snowball, to convey the growing nature.

Or just say what it is, compounding growth.

You guys always gotta make stuff more complicated than it is.

The English language is full of idioms and metaphors; marketers are hardly the only ones using them.

Actually "snowball" probably makes more intuitive sense to people than "compounding growth."

A snowball rolling down hill is a metaphor for compounding growth.