It was made on 2b2t, the seed is well known: -4172144997902289642. FitMC makes a video where he shows what the original spawn looked like: https://www.youtube.com/watch?v=ksS00MCQPog

There are tools to find seed given some obstruct information like cacti height or bedrock patterns, and it's a problem for those trying to find a private spot on anarchy servers like 2B2T.

https://www.youtube.com/watch?v=36q4Ze0kFu8

https://github.com/DaMatrix/SaveSearcher

The freedom of loosely moderated minecraft was amazing back in the day. I traded hats all the time between being a shameless griefer or actual contributor to community projects. I remember one server far away from spawn had a growing 1:1 imperial city from Oblivion build going on, that they specifically didn't want to use any build tools for (server admins project). Because of the vertical scale and height limit of the game at the time, they had to dig down to bedrock. You'd actually be "employed" by the master builders to simply clear out stone and dump it into chests. They'd provide you with seemingly endless diamond pickaxes and shovels, along with whatever share of the cobble or ore you'd want although you'd have to haul it out to your base wherever that was. I must have worked for them for months. I wonder if they ever finished the build. They had the central tower completed though.

What is the issue? You can still download the world files, but it would be inconvenient to store them in Minecraft's unoptimal format.