I get that no one likes to be fired, especially if they feel that they were let go unfairly, but this seems like it will result in missing out on other job opportunities afterwards. If I was a hiring manager and saw a video like this from a prospective employee I would just throw their application straight in the garbage. If they will post this then who knows what kind of private company details they will post about if I were to hire them

You can choose what you write on an application.

But you can’t choose what people search about you before hiring you.

On the other hand, I think the people doing this are aware of the risk they’re taking most of the time. They know people will search their names and see what comes up before hiring them.