Specifically, you are not allowed to give people any incentive to post insubstantial posts in your threads. You can't offer to pay people who post their addresses, usernames, etc. You can do giveaways off-site and link to the giveaway page in a thread, but you can't give people any bonus for replying to your thread.
If this guy gets banned then why aren't people posting signature campaigns getting banned? most of them ask that you post your btc wallet address for payment ect
IIRC, that rule is applied only to the altcoin section.
Giving people incentive to post in the bitcoin section is alright. Indeed, there are a couple of bitcoin giveaway going on in the Games and Rounds section.