Yea, but that is not something that should be a common experience. There is no good reason to fire someone day 1 outside of like, bad faith issues like lying about your background or basic capability to do a job (Senior Linux Admin who doesn't know what a command line is etc.).

Yes, that would be the only reason to fire, and the only reason to lay off would be a massive change in financial outlook. For example if your biggest customer just switched to a competitor and now you have to do a big layoff or risk bankruptcy.