Increase cap limit, server reset to default after a win? That way people wouldn't spend time building huge fucking pointless forts or digging out mountains.

There should probably be a time limit as well.

Yeah, the reset idea has come up before, but I never thought of it as a means to combat greifing. Sounds like a good idea, though it will only cut back, not stop. I think Ben has been working on, or at least has a reset function planned for later releases.

but first, we should increase the default cap limit to at least five, because three is too short

I think that most everyone who plays AoS regularly can agree that we have problems with players who do nothing but build wasting player slots. I propose a simple solution: Make the map reset on team win and reset scores.

Builders leave because their work gets 'auto-griefed' by the game.
Griefers leave because there's no builders to grief, and because griefing combat structures produces very few tears.

This doesn't fix 'griefers' who switch teams and remove structures the other team has for an advantage, but those players are more rare than people think.