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They reached the trillion-dollar sum by multiplying the state law’s up-to $5,000 per-violation fine by the 550 million social media exposures Jones’s audience received on his Facebook, YouTube and Twitter accounts in the three years following a school shooting that claimed the lives
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So if you argue that each post to each person is an instance of aa violation as it's an attempted sale of his products, then they multiply out that way.
It's the lawyers role to advocate for a particular reading of the law.
You could argue it other ways too, eg. every actual sale, or every post is a single instance of an attempted sale (but in aggregate, rather than per individual).
But, I'm not a lawyer, and I'm interpreting the law as written in that except from the Bloomberg article, not the statute, so, don't put much legal weight on the above.