This is an interesting site, it deals strictly with owners of Bitcoin rather than just pretending to offer that service. The service they provide here allegedly doubles the bitcoins in you wallet using lightning fast trading ahead of the market. Sound familiar? Well let's see what they are promising:
"DoubleBTC is a fully automated Bitcoin doubler program operating with no human intervention. Take advantage of the power of our high-frequency trading platform. Using machine learning to study and predict the bitcoin price, our servers open and close thousands of transactions per second, locking in the price difference and transaction fees as profit."
So it does sound like a lot of nonsense as there are only a set number of Bitcoins that can be issued due to the cryptographic nature of the coins, so if everyone could double the number of coins they had, the currency would be worthless.