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:
How feasible is it (legally, technically) to host a federated, read-only copy of Reddit data from before The Enshittening?
It depends how mad Temu Elon aka Steve Huffman gets about it. He incorrectly believes everything belongs to him.
You could make a zim file out of it and share the zim file. I imagine it would be quite large though.