Is there anyone archiving all of reddit? Or twitter? I mean even if their terms have changed to not allow it.
There used to be one such project (Pushshift), before the Reddit API change. You can download all the data and see all the info on the-eye, another datahoarder/preservationist group:
Not that I know of, and you haven't even been able to archive tweets on the Wayback machine for YEARS.
Given that Firebase (which powers the API link at the bottom of this page) is a Google property, I cannot possibly imagine why they'd differ