Some weeks ago, I told two of my friends about bitcoin and how to use it, I tried to devote my time for them. The two of them like bitcoin they were interested. I opened electrum wallet for them. After some weeks, it was even yesterday, a friend of mine contacted me using Whatsapp, he told me what he saw online, that it is even possible to double bitcoin online. He wanted to double his bitcoin, I told him that it can be a scam that he should send me the link.
https://bitcoindoubler.tech/
The website want people to deposit a minimum amount of 0.002 bitcoin to a maximum of 10 bitcoin, that in 10 hours the bitcoin will double. I told him immediately not to do it that it is a scam. I would have blamed myself for telling my friends about bitcoin, but I was happy because he did not send his bitcoin but told me about it before doing anything. But why are scam very obvious now, some are even having domain and nothing done about it. Is it because cryptocurrencies are not regulated the way it suppose to be or this is just how the world is?.
Good thing that your friend asked you first before trying to send his money to a strange website. It's true that you can possibly double your profit by just investing in bitcoin for a long term. But there is no such thing that you can easily double your money in bitcoins by just sending them a money because it is just like a Ponzi scheme that you could earn money by just inviting, which is obviously a scam.