Companies should accept this and be willing to invest in their employees, not just use them as cogs.
Luckily there are plenty of Big Co jobs... but most still seem to ask for 2-3 years of experience, aka we can pay you crap AND not train you, a win win.
I've personally seen two bootstrapped companies locally who invest in college graduates and pay them slightly below competitive wages; they have some of the most loyal employees, and more competition for job openings than they could ever hire.
It's not ideal for every company, for sure, but it does work.
On the other hand, in most or all of the companies I've been somehow related with, more experienced developers have naturally invested their time in helping juniors learn.
Vs 6 months of training at fulltime pay, would be maybe $70k cost to a company?
Yes, it is far cheaper to interview tough vs train employees (for right or wrong)