I doubt that these 750,000 roles exist in the first place or that these companies offer salaries high enough to motivate workers to fill these roles.
You're likely to attain more worthwhile knowledge by purchasing a second-hand wireless router, dumping the firmware, and finding a null-pointer dereference bug.
Let's keep in mind that a lot of these cybersecurity roles are for people who are meant to be cogs in a machine. Certifications can be useful for people who are new to the field, but for the jobs that require them, they're more like a screening tool than anything else. Unfortunately it means the tests are on the certification material and not the current reality. It's a pain when you know better, but likely better than a company being staffed with workers who don't know how to pass an exam.
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Let's keep in mind that a lot of these cybersecurity roles are for people who are meant to be cogs in a machine. Certifications can be useful for people who are new to the field, but for the jobs that require them, they're more like a screening tool than anything else. Unfortunately it means the tests are on the certification material and not the current reality. It's a pain when you know better, but likely better than a company being staffed with workers who don't know how to pass an exam.