This is a warning. For the last 18 months, so-called services like the above title have been sprouting like mushrooms specifically in the Bitcoin ad/faucet industry.
Most are straight up ponzi schemes where only the earliest participants get to actually double their bitcoins. And then, BAM! The website is gone.
But unfortunately for the degenerate gamblers, some are just pure scams where you think there are many participants because their site shows a dynamic stream of bitcoin transactions - where it supposedly shows “investors” are getting their earnings and capital back. It’s all fake. It’s just a random copy of transactions from Bitcoin’s block explorer.
Don’t be a fool. Gamble like a man here.