Can you give an example of what you are talking about.
My experience with duckduckgo specifically and the (modern, clear) internet broadly, has not mirrored yours. I don’t frequently incidentally or unintentionally run into illegal or even very explicit content accidentally. I’m wondering if we may have very different ideas of what is explicit or how sanitized the internet (or world) should be.
I’d appreciate knowing more about what videos on duckduckgo were “illegal themed” in your eyes?