Old reddit still works for me even without login though. I'm too lazy to figure out which from the multiple of userscripts and addons I use allows it, but apparently the block is done half-assedly and easy to circumvent.
It still works for me too (I have no account on Reddit and have no intention to have an account, even if they try to insist), and it is also possible to add .json on the end of the URL for JSON data (although, so far, I only use this feature to view pictures at the original size that are too small if I do not do this).