Earlier quoted context omitted.
Who will enforce that? The policies are made by companies themselves and they can change them whenever/however they want with no employee welfare in mind. We as individual employees don't have any power influencing or enforcing those policies. The idea behind organized workforce is to balance the power dynamic between employer and employees. It's harder for employer to ignore the demands of an organized workforce tha…
The employer can't unilaterally change the terms written in the offer letter. That would be clear breach of contract. Any state or federal court in the US can enforce this. I'm not sure how it works in other countries.
In other countries the notice periods are written in law. But then again, do we really want to wait(& trust) for the govt which is heavily lobbied by FAANG to legislate this? Isn't it more efficient to organize and demand your terms from the employer.