I think it's wrong to base our policy about legal questions on our policy about math questions or art questions. These things aren't comparable.
If someone takes bad advice from an approved answer about art, which was given by a well-meaning novice who didn't know what they were talking about, then somebody's character models might wind up crinkling at the shoulders when they lift their arms.
If someone takes bad advice from an approved answer about maths, which was given by a well-meaning novice who didn't know what they were talking about, then sometimes a collision might not be detected.
"We don't prohibit people from answering questions about Unreal even if they've literally never opened the Unreal Editor. Sometimes these users can still provide a great answer." - @JoshPetrie
This is absolutely true. Sometimes they can! And when a well-meaning novice who doesn't know what they're talking about provides a bad answer, then maybe the asker loses an hour trying to make that suggestion work. That's a shame, but it's not really a huge deal.
But if someone takes bad advice from an approved answer about what's legal for them to do, which was given by a well-meaning novice who didn't know what they were talking about, then somebody could take an action which turns out to be illegal, be sued, end up bankrupt, their company destroyed, future wages garnished, their employees out of their jobs, etc. This is all entirely plausible.
There is simply a different level of risk, when we're talking about bad answers about the law, than when we're talking about bad answers about art or bad answers about math or bad answers about the Unreal Engine.
Questions about legality should be referred to Law SE. They're much more likely to be seen by somebody with at least a cursory understanding of the law over there, and the law-focused moderators and regulars there are more likely to be able to identify and down-vote any bad answers, than are the development-focused regulars here.
It's better for the asker (they'll get better answers), and it's better for the SE network in general (better-quality answers across the network, because the topic experts are the ones seeing the question and voting on the answers).