There was a discussion about this (specifically a reposting bot) and it’s pretty split between allow, disallow and allow only in certain subs. There are definitely a lot of communities here that are empty or nearly so, but I think most would rather see organic growth instead of automated reddit-cloning.

I have used reddit archives as one of the sources to find content to kickstart communities, but I assume you’re talking about something in bulk that’s a lot more automated.