And FAANG is not all tech.
Like, let's say we're in a world in which everybody is just a hard-edged economic realist and no sentiment or loyalty ever gets involved in anywhere. That's the world where you don't want to piss off your employer.
It's the world where employees are super valuable and coddled where all this, "well, I'm just showing them what it feels like to be me" is a viable tactic. That's the world where they care about your reciprocity arguments.
The point of building a good professional reputation is not for the benefit of employers everywhere. It's for you. To the exact extent that you think that employers are faceless soulless monoliths that don't give a shit about you is the extent to which you should stack the deck most in your favor for getting hired. If reference calls are going to be like, "Hey, I think that Bob has a really good heart and a ton of potential," then okay, maybe your minor indiscretions are NBD. To the extent that reference calls are, "I would not hire Bob again," that's when you really want them to say, "I would happily hire Bob again."
At any rate, all of this is trading in hypotheticals. I don’t actually favor quitting with no notice, but in such an extreme case, I would assume it was done with sufficient justification that one’s colleagues, perhaps even one’s direct manager, would be sympathetic to the quitter.
That being said, your relationship is with your, former and current, co-workers. I am rather good in blowing bridges up if I think someone else put them on fire first. But even then, I took great care of who was on the other side, as much for my own sake as for the sake of my reputation and relationships with others.
Because even if you don't give a single f** about your employer, your co-workers will remember as would you. Especially if all of a sudden the job market is favouring employers again.
But now it happened in FAANG so it burst the bubble of the proportionally few who used to feel special.
You might think your employer is horrible, but it’s the ones that smile and stay how great the company is that will get hired.
When you NEED a job, people will go back to being company-pleasers.