1st rule won’t stop spam.

3rd rule will bring about too much frustration for non-spammer users.

I’d add:

• no community creation for accounts with less than x comments activity
• only one new community creation per month (?)
• automatic deletion of the communities with no activity over a month (voting/commenting/adding new posts, etc)
• the possibility to choose “do not show threads with LESS than x upvotes in main”