Typically, in my experience, companies are paying for these. In my experience from decades ago, these sort of programs were oriented towards e.g. people who had come up through the engineering ranks, didn't have an MBA, and were being groomed for more senior management.

Of course, that was from a time when MBAs were probably more of a requirement even in tech for senior exec roles than they are today. These programs obviously still exist but I'm not personally aware of anyone who has gone to one any time recently.