Googler... ex-Googler

my take on this is that "2 week notice" should probably apply to businesses as well?

I worked for a well-known SaaS company for 4 years. A few months after we were acquired, I decided it was time to move on. I gave a 3 week notice to ensure everything was properly handled before my departure.

Two days later, I couldn’t log in to my PC. I was, for all intents and purposes, fired from my actual work. Technically, I was still employed and paid for those remaining days, but I was locked out and never got the chance to say goodbye. It was the worst experience I’ve had, and I never had any issues with any manager or anyone before that. Apparently, it was just the new company policy.

That's standard practice for tech companies. Once you hand in your notice your access is cut and you'll be escorted off the premises that day.