The devil's in the details and has nothing to do with what company is involved.Except in this case, Sony denies it and everyone believes them. Crytek denies it and people still believe the original article.
For the Sony rumour, it was about a game with a single source claiming it was cancelled for which a head honcho quickly denied it.
For Crytek, the rumours suggest unpaid workers, which is very different, and Crytek haven't denied that. They said they are carrying on and had positive buzz around E3, but didn't say, "no, all our employees are being paid on time. We had a glitch one month that delayed payment for a couple of studios that has result in some staff claiming to be unpaid, but other than that, business operations are as usual." When rumours involve unpaid workers, they tend to end with the develop closing from what I recall of similar past rumours.
Hence the rumours itself is stronger, and an analysis of the situation does make one wonder about Crytek's business strategies. The official response seems to be that they have some cash injection, which in turn doesn't cancel the rumour. It would just means it's right (Crytek in financial difficulties) but they have a solution that isn't bankruptcy (get investment).
Human beings always believe unsubstantiated rumours/information. Has nothing to do with the internet. Someone tells you a fact, you tend to accept it, which leads to lots of misinformation and the creation of programmes like Mythbusters that frequently disprove everyone's unsubstantiated, assumed knowledge. The internet just accelerates the range and speed of travel of rumours, but the behaviour of the people using it is the same as ever.I just find it interesting that the internet at large is so quick to believe unsubstantiated rumors...