Since Venom was made which was like AGES ago, i think he would have stollen many accounts by now. He's a person which is respected by this community and Queen is not one to steal.
What original proxy did he base his one off though. If your talking about N-Proxy then i know that he didnt embed any hidden commands. These commands have all been found out

. His proxy has been tested by some of the best minds from this site and it has been given thumbs up from all. They have checked to see what ip addresses information is sent to and none of the ip addresses are suspicious ones.
And using older versions of Venom will not give Queen access to your accounts. It still has the same coding inside of it which means that he would have to remotely update old proxy's on MANY COMPUTERS world wide to start to get access to accounts. They still have the same source codings embeded which doesnt mean that they can tell that the version is "Old".
So in conclusion to your question, it is still fine to use Venom and you should continue to use it for it has been tested over and over again. It has been scanned and unpacked by some people and i think that if their was anything suspicious then someone would post a Warning Thread and let Moderators know.
Hope that helps you feel more comfortable
Hiyoal