Had a friend who worked for a company that outsourced a couple of groups to H1B workers. People would get a severance but it was conditional on providing turnover to their replacements. The turnover would take about 1-2 months, depending on the job.
My friend started looking right away, found a job within days and had to start in two weeks. Gave his notice and they freaked out, as he would not be able to fully train his replacement. Hated leaving behind friends, but everyone there understood. A couple of people left like that - one person just handed in his keys and walked.
I told my friend to NOT answer any questions about the job he left unless he got a Hold Harmless agreement from the company. He did receive some calls about various things he was responsible for, but he was so busy onboarding for his new job, he never returned the calls.
The company ended up being sold to a larger competitor a few years later and shortly thereafter closed the office where he had worked.
I should also mention he told me that when he gave two weeks notice, one of the supervisors mentioned that he wasn’t being very loyal and supportive of the other workers by giving such short notice.
He said nothing, but did mention that at the exit interview with HR. He said the lady doing the exit interview just stared at the desk when he told her that - maybe because of the irony of the supervisor’s statement.