Keeping wages down: a company teaching other companies methods to not hire U.S. workers so they can apply for more, and far cheaper, H-1B (non-immigrant visa) workers:
Now, legally speaking, a company is supposed to pay a H-1B worker the same wage as they would a non-H-1B worker. However, they get around that by using the method described in the video. Say, they want to hire a worker with a university degree and 5 years experience for 25k a year when the average starting wage the market has with zero experience is 50k. The company will automatically disqualify any applicant who put a desired wage anywhere above the 25k they are seeking, even if the worker would accept a lower-than-what-they-printed-in-the-application wage if asked. Since the company does not seem to be able to find anyone "willing" to take their low wage or anyone who fits into their odd-ball requirements, they go the H-1B route and hire that worker for 25k.
The hiring company also has far and away too much power over the H-1B worker. If the workers find they are being exploited as such, the company can threaten to send the worker back to their home country as a way to keep them quiet since, as non-citezens, they have almost no rights they can exercise within the U.S. legal system for recourse. Another thing is the worker might not want to risk the low wage they are getting: while it may be fraction of an entry-level wage in the U.S, it may be significantly more than they make within their own country.