https://web.archive.org/web/20260000000000*/https://old.reddit.com/
Years of archived Reddit history have been lost. This likely happened because Reddit wanted to stop AI companies from scraping archived pages instead of paying for data (announced in the news last year). Reddit's methods of combating AI scrapers are making the site worse and worse for humans.
Although the comments on some of the other posts about this topic mention robots.txt, https://old.reddit.com/robots.txt seemed to be the same in 2018 based on archive.today.
User-Agent: * Disallow: /
From what I heard, the data will probably not be deleted from the Internet Archive, but will remain inaccessible as long as old.reddit.com is excluded.
Edit: As stated by /u/Nintendofan885 , The Wayback Machine stopped automatic exclusions based on robots.txt in 2017
This came after an announcement that Reddit will become a " logged-in only experience " and an update that removed the workaround to view Old Reddit logged out ( preventing archive.today…