Of course. The conversations point out that one frequent problem is the hiring process managed, interviewed and finally filled by different persons.

Place of residence is a different issue. Many people connect behind a VPN. A video feed during the interview would at least hint at the time zone they are in.

Third different issue is right to work in the US. This is an issue you have even in person in the US. Solved with legal documents. Social Security card, green card, US passport... then tax ID, then ongoing tax filings by the employer - Which may be a little easy to forge when presented in pictures but seem to still be sufficient legally. (And here camera helps with "person doesn't match ID".)

Anyway. You are right! Camera solves only part of the problem.