How does someone who is not a real judge able to judge someone on a TV show?

How is this even legal? At least Judge Judy was a real judge, but Chrissy Teigen? Sounds from previews, it is not a show I would watch. How about you?

How does someone who is not a real judge able to judge someone on a TV show?
How does someone who is not a real judge able to judge someone on a TV show?
How does someone who is not a real judge able to judge someone on a TV show?
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