Nothing is sure but if you want to act in your life, you need to take decision based on what you have.
Until now, Cognitive is not a scam while most of mining company are.

I choose to trust Cognitive long ago and until now, I didn't lose anything which is great and I will probably make a good profit in the coming months.
From experience, I think that mining Bitcoins is too risky compared to the reward. Cognitive will be my last investment in mining.