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:
God, post-digg era was peak. When subs like r/fffffffuuuuuuuuuuuu were still active. It was just folks talking about their lives and relating to eachother. Then we all grew up, life got serious, and the culture wars started.