Yesterday, I visited new Reddit. No VPN, Chrome in incognito mode, so no extensions, clickedon a link directly from Google search. Got a message that my access was blocked for security reasons. Copied the link to Firefox (with uBO and a few privacy-centric extensions), changed it to old reddit (where I was already logged in), and it worked just fine. I found out that when Reddit kills old reddit, I won't even have the choice to switch to the new one (not that I ever would) because I'd be blocked anyway.