Some companies does not allow employees to write code outside of work, I work in a 50+ Billion company, whose policies clearly state that, you can be fired for

Some companies does not allow employees to write code outside of work, I work in a 50+ Billion company, whose policies clearly state that, you can be fired for writing code even in your free time. We even have a "training" to clear any misunderstandings, It has been conveyed explicitly with past examples of people getting fired.