Not sure about that, it could end up being counterproductive, I mean, reddit is full of spam, if there’s no good antispam feature here you could ruin communities with a bot copying content.
Not to mention that if someone on reddit realizes there are bots copying content, they could even spam the subs on purpose.
I believe it would be better to do it manually, copying the source in case of links, not copying text post, that wouldn’t be honest IMO.