Just wondering, how you define "technology consultancy and marketing" in a manner that is robust enough to fit a legal usage?
And talking about "academic", if we had laws that ban folks from working after they have been shown to be peddling hype, that could really shake up the academic world. After all, in academia if you have an idea you want to research you need to "sell it" (probably with plenty of hype) in order to get funding. And that funding may result in no gain other than a negative result. Ergo an academic can no longer work in academia after their first failed research project.
Now I think about it, perhaps that would be for the better.