I don't have a problem with bots mirroring Reddit content as long as it limits itself to not overwhelm Fediverse communities with more content than the people subscribing to it can comment on. Bots should ideally keep an eye on that and throttle themselves on that basis.
I think the lemmy instance that's only for reddit reposts is a great way to go about it. You always know what you're in for if you sub anything there, and it's not taking up space on other servers.