I think this only scratches the surface. China has a social credit system. Who's to say that these major corporations do not have a employee rating system? Speak out about layoffs? Your rating goes down. Agree to come back to the office? Your rating goes up.

How much longer before these types of internal valuations work their way into a database for other companies can see?

Take it one step further: what if you apply for a job, and that job knew that you had walked out in protest at your last job, organized to create a union, or maybe refused to come back to the office because you wanted to work from home.

What impact would that knowledge have on your chances of gainful employment?

Corporations can cancel people too...