I doubt this. But I am very much sure about that risky part. I would rather let my Bitcoin sleep in a wallet I alone control the private keys than let a third party manage it on my behalf.

First, there is no guarantee that they understand Bitcoin's price movements better than you. To a certain extent, we are all blind speculators. Second, they could exit scam. Third, they could fail to deliver as promised. Fourth, they could get hacked. This list could go on.