Hey! So I'm not a copyright lawyer, but I'm a member of a lot of different modding communities. From the Sims to Skyrim to Minecraft. protecting your intellectual property when it relies on another's existence (in these cases, a video game) is common subject matter.
One of the big differences in this case, however, is that mods for Minecraft often include written code or completely new assets which can absolutely be copywritten. Here, we're talking about the specific arrangement of Minecraft blocks in a world. If we take the recreation of the construction out of the equation, the only way to transfer the information in a Minecraft world would be to send someone the save file with a construction in it. Since that save file relies on Minecraft's code base to be read and interpreted into the playable world, the save file cannot constitute as an independent piece of software/information. (I believe 3rd party software can open/create maps for the purpose of world creation, but I'm not familiar with those tools precisely. In any case, all of these tools would rely in some way on minecrafts original code base.)
In essence, this means anything created in the world of Minecraft cannot be copywritten by an individual because it relies in some way on Mojang's/Microsoft's assets. Legally speaking, I don't think you could be taken to court for creating something in a video game identical or inspired by another player's work. In Minecraft's ToS, it's likely specified that everything created in-game by the player is property of Microsoft. This is typical on social media platforms and games alike, but of course feel free to double check.
That said, the community tends to look down upon servers that copy builds since nine times out of ten the creator of the build specifically asked you not to. In my opinion, that request is entirely unenforcable and there are no concrete consequences for doing so. It's really just a matter of being polite since nothing can realistically be done about it. Even if an individual could take legal ownership over a Minecraft creation, the costs of launching a suit would only be justified if a very large server had infringed your work. Even then, it's probably not worth it.
By all means, if someone has a different stance on the matter I welcome them to correct me if I'm wrong. Hopefully this helps either OP (or maybe I can learn something new, haha)
