1st experience: Told my boss I am leaving. My boss’s boss calls me in a room , tells me he has some great projects for me and that we will work together on them. I agree. Turns out it was his last day!
2nd experience: Similar situation, told my boss I am going to a startup. Boss’s boss calls me and gives me a lecture about how it is a bad idea to go to a startup. I leave. A few weeks later I find out he also left for a startup.
Some time later I met the boss from the 1st experience and he told me “sorry, but it was not personal. I was just doing my job”
If you are in a megacorp your job should be to extract as much money as possible while doing as little work as possible. Because your boss's job is exactly the opposite.
Your coworkers are not out to get you but your managers are. Don’t fucking ever trust them.