Is it illegal/poor taste to port content from Reddit over to Lemmy?

Edit: It seems like there's enough people that would prefer this didn't happen for some pretty good reasons. For that reason, I'm not going to move forward with this idea.

I was thinking it'd be nice to have a bot pull top posts from Reddit, and repost them to their corresponding Lemmy analogs to help bolster the content available on Lemmy while it's growing. I'm not sure if this kind of functionality would be desired by other users, or legal under Reddit ToS. I was thinking that if this was desired, it could be done for cheap under Reddit's new API costs. An effort would also be made to prevent reposts as well. I would definitely like to hear everyone's opinions on this.