This is the #1 problem with google/facebook/other giant companies - zero due process. They build a business around minimal human interaction with our staff and it shows when real problems come up. I'm frankly sick of hacker news being a facebook/google/whatever ticketing system. And yet, there's no alternative.
The problem is, Due Process means a human - probably paid very little - gets the power to overrule any technical controls. So maybe your account is protected by $$$ A+ security, no chance it can be breached, but oops, the "Due Process" person was just handed $100 cash to override that and allow this random person to become Justsignedup.
So you might actually be better off with a Google situation where the company can't be bothered to hire anybody to be in that role, than a situation where they hire a bunch of minimum wage workers in the cheapest economy with plenty of Internet and don't care about oversight.