In public companies, it's not really a scam. It's a legitimate tool for these companies to get and keep the key people they need. The stock benefits are over and above their salary, after all, and equate to real money.

It's the startups and private companies where this all gets a bit scammy, because there is no liquid market for these shares. And those companies are more likely to offer extra stock instead of a competitive salary, but that stock may not be able to be cashed out until the company goes public, forcing the employees to stay until the IPO, unless they give up that theoretical big payday.