This article doesn't even scratch the surface of how "job consultancies" game H1B. I know for a fact that these "job consultancies" apply for H1B for a person using their services, as an employee of more than one company. Employees needing sponsorship typically apply for H1B through the company they are actually working for and as employees of couple other companies that they don't actually work for (the "job consultancies"). So effectively, the person's probability of getting picked up in the lottery in a year is tripled.
Once they secure the H1B, the person is more than willing to resign from the current employer and work for these "job consultancies" temporarily. And since H1B transfer is not that complicated, they jump ship to any other company later.
Once they secure the H1B, the person is more than willing to resign from the current employer and work for these "job consultancies" temporarily. And since H1B transfer is not that complicated, they jump ship to any other company later.