The terms involve the person paying back the training costs or some penalty if they quit before X years.

I saw it once at the beginning of my career but that was nearly 15 years ago.

US companies are usually unwilling to enter into any contract with labor because they want the ability to renege on the deal at will, hence the at will states.

You see companies making contracts like this with other companies all the time, so I can only assume it’s a cultural value to never make a deal with labor.