I disagree with your take on corpo environment. If what you’re saying would be true, then it’d be far more profitable for corpo to hire a bunch of Linux-oriented technicians and thus save costs of IT layer. But corpos don’t do that. You’re suggesting a paradox - a body that relies on cost-cutting and making everything as profitable as possible, that also is ok with wasting money on something that’s allegedly easy to replace.
Hiring Linux professionals would require competent IT management. Most corporations don’t have that.