ViViDboarder was not saying anything about the trustworthiness of any particular source of jailbreaking software.
Rather, his opinion that this particular security vulnerability is more severe than most others that have been used for jailbreaking, is based on a completely different argument.
Most other methods of jailbreaking have involved a series of deliberate acts. Acts complicated enough that, even if the jailbreak was secretly delivering a torjan horse, they should still set off alarm bells in the user's mind that they are about to do something risky or unauthorized. Thus they are actively making an affirmative decision to assume the risks associated with the jailbreaking process.
On the other hand, with this particular exploit, depending on how the jailbreak is presented, the user might not have the opportunity to stop and think, "do I really want to jailbreak my phone?", because the exploit could be crafted and advertised in such a way that they don't even know they're abut to jailbreak their phone in the first place. Potentially, all they have to do is follow a link from any random google search to a maliciously crafted website, and before they have a chance to know any different, they've had code injected onto their phone without their consent. Therefore, the user might not have an opportunity to make the affirmative decision to assume the associated risks.
The key distinction is the absence of consent. That makes this sort of vulnerability more severe than most that have been used for jailbreaking in the past, and it's a bad thing for every iPhone user, regardless of whether or not they're interested in jailbreaking.
The sooner Apple releases a fix for this vulnerability, the better it will be for every iPhone user.
