Lodge Essential Enamel Cast Iron Dutch Oven, 6 Quart, Island Spice Red

Hmmm... perhaps for "Enameled Cast Iron", where the coating is ceramic, you have a point.

But pure cast iron is just that: Iron. Iron isn't "pure", it will have varying carbon content and other metals. But these metals (and other materials) all have far higher melting points than Lead, so Cast Iron itself is probably lead free (otherwise: the metallurgy process probably would fail if you didn't purify the Iron Ore enough before casting it)

The simplicity of the design and manufacturing is one of the reasons people buy pure, classic cast iron skillets. There are strong guarantees built innately to the casting process. The iron doesn't need to be particularly high quality either for the pan to work.

Higher-quality metals (ex: Steel) are somewhat against the point of cast iron. Steel pans are smaller and thinner, but the point of a cast-iron skillet is the huge weight which slows down the cooking process. A cast-iron skillet is slow to heat and slow to cool down, because its made of super-heavy iron. Aluminum or Copper Frying pans have a similar issue: they are so lightweight that they won't make the same kind of sear as a classic cast-iron pot.

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But I think you have a point about lead-worries in Ceramic-enamel Cast Iron products like: https://www.amazon.com/Lodge-Enameled-Classic-Enamel-Island/...

The paints and ceramic composition are far more ambiguous and subject to quality-control issues. Lead used to be very common in a variety of paints