My friend just created a new Aternos server, with nothing changed, Minecraft version 1.16.4. My friend or I didn't even manually change the seed. We joined the server, we noticed that we spawned in a badlands biome, so we wandered around the world a little bit, and my friend noticed an ice biome, so she said to me "Wow! This is a lucky seed!" So I checked the seed.. The seed was 478868574082066804. I searched up the seed and I found that It's a.. Herobrine seed..? I was shocked that we were so lucky of actually spawning in the old Herobrine seed in Minecraft 1.16.4.
Is this an Aternos thing of putting every world on the Herobrine seed, or is it just luck? Please someone tell me, I'll be waiting for a response.
The chance of randomly stumbling across a particular seed is one in 281 trillion (the game uses a 48 bit random number generator to randomly generate a seed; just to be sure this site says that "478868574082066804" is a valid random seed) so I very highly doubt that this was due to random chance, it is even likely that only one person has ever randomly generated a world with this seed (there are about 600 million registered accounts; if every one of them created 100 worlds there is still only a one in 4691 chance of getting a particular seed).