The best thing to remember about online 'make money' offers is....
Is it too good to be true?
- If they say you will be making 50k+ a year sitting at home doing minimal work then 99.9% chance its a scam.
Do you have to pay for it?
- When you go for a job interview do you have to pay them to interview you? The only way you should have to 'pay to make money' is if you are purchasing a raw material or product... Not to join to figure out how to make money.
Its a common scam to sell information to make money - if its such a great way to make money then why do they need to sell the idea.
I have never used googlecashkey.com but from the looks of it I would say its a scam. If you want to actually make money online there are several options (Most require alot of work to get started and in the end will pay out the same as a typical job but is often more enjoyable)