Comment by morpheuskafka

> As I said, this is inherently a violation of the commitment the visitor made when entering the US on a non-immigrant visa, as much as (say) exceeding the limit on the hours per week an international student can work.

Your concept of "commitment" doesn't match the legal structure here. A visa is not a contract with the government. What is relevant legally is whether the information presented was truthful at the time of entry and of visa application.