Educators: What stops a student from uploading AI-generated text as their writing sample?

Clear rules at upload. The writing sample has to be the student's own earlier writing. It can't be AI-generated, it must be at least 500 words, and it shouldn't overlap with the work it will be compared against.
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Automatic checks at upload. These checks turn down writing samples that look AI-generated, too short or nearly the same as the assignment, and ask the student for a different one.
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The writing sample is only part of the evidence. Even if an AI-generated sample got through, Validate still checks the submission itself for patterns of human writing. The student also has to answer questions about their own submission. A writing sample that matches the submission can't make up for weak evidence on the other signals.
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You get to make the final call. You'll see the Authorship Continuity result alongside the other signals and the student's answers to the questions.