It's the old "why train an employee (or let them learn on the job) if they could quit and go to our competitors" coupled with employee loyalty to the company go

It's the old "why train an employee (or let them learn on the job) if they could quit and go to our competitors" coupled with employee loyalty to the company going down (probably to match low company loyalty to employee levels) and companies want people pre-trained and ready to go. It's up to the employee to ask for a premium for this, and most can't. So you're not wrong. It's where things are going not only in software engineering but other professions as well.