I use Livecoin exchange from the start frequently and never had a single problem. I know, they can not be trusted, but not more or less, as any other not regulated crypto exchange with no legal entity or registered in some tax heavens. I use Livecoin exchange, but never hold anything there - NOT YOUR KEYS NOT YOUR MONEY! Never send my full stack in one deposit and do larger amounts in small batches, deposit - sold/buy - withdraw, next batch. Of course, it cost me time, money, is annoying and not suited for many other traders, but is the only way to be safe and cut the losses, to the minimum on these exchanges.

Participated in the first campaign and don't see a reason why should I not advertise them further? Because of one scam accusation?

I was against ending the first campaign and to call them a scam if thousands of other people use this exchange with no problems every day. This scam accusation is very complicated and should be rather seen as a support issue and not a scam in the first place. We all know it was all done for a purpose and now is the next part of the drama.

There will be no other way as to stop all campaigns on the forum if this will go further because almost everything what is advertised here is to some extent not legal or finally turned out a scam.
OP mentioned already a few campaigns actually active and there are scam accusations against them.

How can Livecoin by judged so badly when there is only one accusation on Bitcointalk forum and no other victim so far?
This case is a really hard one, were the exchange keep providing answers from two years. The accuser is also not without a fault and to blame. Is obvious that he was lying a couple of times and spreading false information about the exchange and admitted it.

Just take a look at the whole picture and take into consideration all other campaigns which are running and there are multiple scam accusations against them. I was able to find scam accusations against all exchanges from the first 10 on Coinmarketcap. Checked also few gambling services actually advertised here on Bitcointalk in signatures and also there are many scam and other accusations. Some already resolved and many are not. Don't mention Cheapmixer which is totally not legal and will be closed as soon as they catch them, we have already seen this happening with many other mixers and last time was Bestmixer also advertised on the forum.

What effect do we have so far with all these flags against Livecoin and this new account? Is there anybody saved from using this exchange and not scammed? Or maybe something has changed and the accuser got the money back and TOS will be adjusted? NO!

The only outcome was that many members lost their spot in the campaign, Hhampuz a job and now it goes even further because we are already on the Yahoo blacklist and maybe 30 more members will be tagged for nothing. Disaster keeps spreading like a wave and nobody see it. This will end that all campaigns will be banned from the forum.