It could be as simple as creating a whitelist of verified contributors who are trusted and routing everyone else through a filter. Or identifying the most serious offenders by looking at volume and frequency of contributions, making a list of the ones that are obviously automating, and routing those through the filter, which should still significantly reduce the number that require human review.

Neither of which are perfect solutions, but it could make the situation more manageable if you don’t trust people to be honest about whether their info was generated with AI.