Check out !worldnews@lemmit.online. The admin of lemmit.online has set up a bot that fetches reddit posts via RSS, making it much easier to make the switch and of course not getting any ads.
Also, these posts can then be cross-posted to help us create more content on lemmy native communities. Although I do recommend removing most of the post body when cross-posting. Alternatively you can turn the cross-post into a native post as if you simply were sharing content that you’ve seen on reddit, but with the perk of not having to load reddit.
You can make requests for subs to fetch at !requests@lemmit.online.
In the end we’re just using lemmy and lemmit’s bot as a simple RSS reader, so nothing illegal or even remotely unethical happening here.
My understanding is that some users dislike reddit but very much like their specific small communities in it. They want to maintain the value of their community without relying on Reddit to host the content, so they are trying to migrate to places like the Fediverse. With that being said, I only support that for smaller subs with their own established community culture. Also, transition is hard so some people want a few familiar landmarks while navigating this new land.