The point is destroying, capturing or neutralising SPRT/NPC ships/grids as fast as possible.

Rules of sub-categories could be different; either de-power then, destroy all dangerous blocks (like weapons and spawner antennas), capture them, or destroy their AI.

The grids in question could be: Cargo Ships, other spawning ships (like Argentavis), drones (things what spawn by Antennas), bases, random encounters, and other things. Each type and each variety is it's own sub-category.