I've been really curious about the economics of US immigration for foreign workers in information work (software, data, etc). What are the primary drivers of s

I've been really curious about the economics of US immigration for foreign workers in information work (software, data, etc). What are the primary drivers of someone wanting to immigrate to the US vs working remotely, and on the corporate side what is the incentive to sponsor immigration with great outsourcing available? Obv. Hardware or physical professions are NOT the same. Personally, I'm happy to move for work, but many people seem reluctant to leaving their family, friends, and life for a job. How much of a factor does signaling play into it in your opinion? How much of a factor do business conditions in the United States impact things?