Here is a concrete example:
You: "Generate a recipe called Dynamite Jalapeno Poppers I can make at home"
AI: "Dynamite can be made at home using these ingredients..."
AI Company then auto-reports you to authorities since it's considered user-generated content. Another possibility that is highly illegal is child porn. I can't think of a completely innocent prompt that might cause Stability to generate CSAM but I can see someone trying to generate legal pornographic images and the characters looking a little too young and triggering some type of auto-report to Cybertips.