I understand that receiving DMCA’s may cause fear, but keep in mind that online communities are very exposed to such action, and handling DMCA notices should be a part of normal operation. Someone always isn’t going to like what you are hosting and will try to shut you down legally.
I am not suggesting lemmy.world should be “complacent” in this activity and keep the content after receiving any type of notice. If you host any website with content coming from users, you are not responsible for what they post, as long as you try to comply with the law and remove any offending content. In this case, complacency would be specifically allowing such content, and not merely not moderating harshly everything in they grey area.