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Most of the contracts should already mention “No illegal activities”, which should cover this, right?

"How could I know this is illegal, if it was sold on Amazon and had great reviews?"

If that’s your defense in court, good luck.

The same way you would know that flying a drone, today, without a license is illegal in the USA.

We are required, in our society, to keep ourselves informed. Ignorance is no excuse for breaking laws in the US.