Peeking at the source, it's just a zero-width div, which is not accomodating of people with disabilities. This might open you up to litigation if you disqualify a blind person on the grounds he gave the wrong answer 'using AI', when he might have just been answering the question his screen reader read out.
This is an excellent point. I did not think of that.
You also forgot people who turn off CSS and JS, or use browsers that don't support them.