Those people's contracts aren't invalidated by revoking access. Those companies are basically saying you're not expected to do any more work except react to our

Those people's contracts aren't invalidated by revoking access. Those companies are basically saying you're not expected to do any more work except react to our emails until the end of whatever the notice period is. And the same thing might be less common but can definitely happen to you in Europe as well, it mostly depends on which sector/roles you work in.