Potentially even bitcoin can be scam. It can close website and all people having money in it - will lose it.
All of us must withdraw bitcoins from the site, or IT CAN CLOSE website and we loose all the bitcoins.
I propose to sign the petition and forward it to bitcoin asking not to close the site.
The only question to the topic starter, which site we should be aware of closing?
You are always suggested to not hold bitcoin on those exchanges/gambling sites.
The reason is simple: If you don't have sole control of the private keys, you don't control the bitcoin.