I have never gone from one job to another where the new job was in the same exact industry I was in prior, but I'm glad I never have to be thrown into such a scenario where I'm accused of taking confidential data, I can only imagine for some employers that makes you a red flag, very dangerous territory to be in.
Apple is known for threatening companies that hire from them, and occasionally having secret agreements with other companies not to hire from each other.
People move from a company to a direct competitor all the time (i have a number of friends that went from working at aws to working on gcloud for example) and guess what, no one of those companies really went bankrupt due to this.
So really long story short: i think apple is being a sore loser at the employee retention game.