Rules clarification

ALLOWED :

1.  Attacking other players for any reason, and taking their stuff.

2.  Taking things out of the chests belong to other players if you USE THE ITEM in the next 24 hours.  i.e., don't steal stacks of cobblestone if you are just going to horde it or throw it in lava.  If a player complains that all their chests are empty, and I find out you did it, I'll assume you were griefing and ban.

3.  Using another player's resources so long as they are automatically renewed.

       a.  You can harvest another player's crops or trees so long as you replant

       b.  You can use another player's energy supply or machines so long as you don't blow them up in the process.

       c.  You can tap another player's power system or reroute their oil supply or reroute their quarry piping as long as you don't break anything.

BANNABLE :

 1.  Breaking SIGNIFICANT blocks belonging to another player.  If you break cobblestone in a wall to get in, or add a button to an iron door, that's ok.  If you smash a machine or something expensive, that's a ban.

 2.  Use of nukes, TNT, or nuclear reactors within the blast radius of another player's blocks.

 3.  Attacking another player so frequently that they effectively can't play.
 4.  Smashing a bed is a 4 hour ban.

Accidents happen.  If you cause an accident (hit someone's base with stray mining laser fire, or set off a creeper) you have a chance to repair the damage.  Refuse to repair the damage or log off, and that's a ban.

Ban durations will vary depending on how decent a player you have been to others, and how impressive your own creations are.  If you build nothing and spend all the time griefing, the ban will probably be permanent.  If you help others and build an elaborate mega-factory, the ban will probably be less than 24 hours.