Anti-Spawn.

Anti-Spawn is a group created by swagpac that destroys spawns in every way possible, thereby preventing new players from escaping.

The group typically simply bombs the area around the spawn (up to 10,000 blocks in the X and Z directions), but sometimes they also build lava and obsidian walls to further hinder new players from escaping.

One of the Anti-Spawn targets, screenshot taken by a direct member of the group.
One of the Anti-Spawn targets, screenshot taken by a direct member of the group.

"come to these coords and remove any grass/dirt/trees you see, you can also just blow up anything, work on the obsidian walls or lava"

The group may have ceased operations in mid-2022.