While it's true these people already work there etc. etc. EB2, just like EB3, requires the DOL certification that "there are not sufficient U.S. workers able, willing, qualified and available to accept the job opportunity in the area of intended employment". [1]
This sucks for firms like Apple because there are quite enough U.S. workers able, willing, qualified and available to take a whole bunch of jobs that are being held by a BS with 5 years of experience... Imagine you are an officer of the U.S. government and a lawyer from Apple sends you an application for a, for example, front end developer. Will you honestly believe that there are literally no U.S. workers able, willing, qualified and available to take such a job? At Apple no less. It's not "some folks won't take a job at Apple/FB/Google/etc for political reasons, so there!". It's literally a claim that there are no US citizens or LPRs who could do that job. How credible you'd think such a claim is?
1. https://www.dol.gov/agencies/eta/foreign-labor/programs/perm...