Ostensibly because high demand fields are more likely to get hired and lead successful careers outside of Amazon.

Logistically it also simplifies things because you can respond to "Why can't I pursue education X?" questions with "because the BLS doesn't list them"

I guess I'm still confused why that matters to Amazon, unless it's part of some world-bettering mission. Wouldn't it be logistically simpler to say employees can enroll in any course offered by the state community college system, and wash their hands of it past that? I mean, they're just offering a perk as part of a compensation package, it's not like they're supposed to be their employees' parents or career counselors.