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Are you new in crypto space? This bitcoin doubler scam is one of the oldest and most famous scam in crypto space. They usually pay people for first few days and then when they reach break-even and made enough profit, they close the site and run away with people's money. Never fall for them, no matter they are registered or even run by President of USA.
It only takes 2 to 3 days then it will run

. This kind of scheme is very popular in social media like facebook, until now there still ponzi scheme promoting there. I remember i also fell for this kind of schene way back 2017 before i learn trading.
Haha, right! Nowadays even 2-3 days are long for these scamming sites. In my early days, I also used to fall for them. Actually my problem was I didn't know what Bitcoin is back then. So I used to buy Bitcoin from my Paypal account assuming it is some kind of investment tokens that can only be used to invest in these doubling sites and then invest Bitcoins in those sites. I lost around 0.02 BTC before realizing that Bitcoin is actually much more than that, lol.