I never trust this kind of events. It's obvious that it's not safe. Hackers captured even Elon Musk's Twitter account and swindled many people. Do not trust everyone! There are frauds everywhere. This is a very simple trick.
Let's all try to stay safe and be cautious, it will be so bad raising funds to invest and after buying your precious bitcoin you in turn give it to scammers for free, there shouldn't be a need of doubling bitcoin, just buy and hodl for a while surely good profit will be made, but going in search of bitcoin doubling surely will bring no good but leading to the hands of scammers, remember anything which is too good to be true is a scam.