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:
Hopefully I stays true for a long time.
The moment Lemmy gets too popular it will come under the microscope of Chat Control/Social Media Age limits.
Federation might save us, but it could easily go the other way and federation itself becomes a target.