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Section 402(d)(1) of the Federal Food, Drug, and Cosmetic Act is what regulates this. It says:

(1) has partially or completely imbedded therein any nonnutritive object, except that this subparagraph shall not apply in the case of any nonnutritive object if, in the judgment of the Secretary as provided by regulations, such object is of practical functional value to the confectionery product and would not render the product injurious or hazardous to health

Since hidden pillars are neither hazardous to anyone's health and also provide functional value, seems like they'd be just fine.

People actually do injure themselves on them, I think mainly through doing "face smashes cake" type "pranks".

Thanks for the research.

That happens here too, but a lot of the stricter regulations apply only to prepackaged foods; I expect this is one of those.

King cakes are another example — commonly enjoyed despite how many baby Jesuses have been swallowed or choked on.

I could tell you but it'd void your cake's warranty.