As a datapoint, this wasn't my experience at Google. Both times I left I gave notice and continued working (with full access) up until my negotiated last day. I don't remember anyone else getting escorted out for giving notice either; in management conversations it was always "how much longer can we convince them to stay around to facilitate a handoff", as this post discusses.

> I saw this happen multiple times. You tell them you're leaving, and get escorted out by security. It's just not worth the risk for them.

Right, but did they cut off paychecks too?

Being walked out of the office is equivalent to having your access removed like I said above. It doesn't mean the person is fired, it just means they don't have access to sensitive information.

In practice, it's not really a big deal. If someone is going from a high-paid FAANG job to another high-paid FAANG job, the new company is usually eager to have you onboard. They can move your start date up. New compensation might be higher, too, so it's a net win.

Anecdotally, this was not my experience at Microsoft in 2013 or Google in 2017.

A policy that really makes no sense. If you have ill intentions, nothing precludes you from acting in bad faith in advance to give notice.

As someone who has recently left a big tech company for a direct competitor to the team I was in, in Europe, even the big tech companies often don't do this.