[flangola7]

For one, how carefully did the user input information into fields. If you're making it up, it will be much faster and less hesitant than a legitimate entry.

That and a hundred other data points help create a ML model that reliability identifies illegitimate activity.

[acover]

Cool! That actually exists, more or less: https://www.nature.com/articles/s41598-018-20462-6