As of a few minutes ago old.reddit.com now seems to requre logging in to access it.
Shame as it was still the best place to browse for info about some niche interests.
Edit: Seems like they might be testing the change as it is hit or miss at the moment.
Edit: Adding this to My flilters in uBlock Origin seems to fix the issue for the time being:
||reddit.com^$header=referer:
Welcome! Lemmy lives on active participation, and you made the right call. Besides, the chatter here can get lively!
Not to mention we have some Lemmywide games and activities from time to time (the most recent being the Season 4 of !thebutton@lemmy.zip, the basic idea of which you may recognize from Reddit), and you’ll need an account to take part!