Unless it is explicitly stated in their terms of service linked from every page of the site. That's our current policy to prevent scammers from advertising.

Yesterday we received an email from moriartybitcoin, we replied in ~3 hours in order to resolve the issue, but he started a smear campaign even before that:

https://bitcointalk.org/index.php?topic=748902.msg8457699#msg8457699

Here is our reply:



And after that he started to threaten us and doing this:

http://bitcoinscammer.com/ (wow, he registered a domain for us yesterday!)

http://bitscams.org/bitcoin-scams/bitcoin-web-scam/a-ads-com-scam

This is the link to his campaign: https://a-ads.com/campaigns/3292

You can see that he deposited 0.1 btc, not 1 btc as he claims in http://bitscams.org/bitcoin-scams/bitcoin-web-scam/a-ads-com-scam

Unfortunately all his further emails and actions confirm our initial suspicions.

PS: Here is our official thread at bitcointalk.org: https://bitcointalk.org/index.php?topic=140822.0