I just always wonder if those billionaires still invest in btc. Do they even know btc exist?
I bet it is a yes. For sure billionaires do also invest into this kind of currency and do already know that this is existing because they have a wide and large access to technology and business so for sure they really know about bitcoin cryptocurrency and they are surely investing into it to make their money grow into a larger one which is a great beneficial to continuously make their money grow since the potential of growing an investment with bitcoin is can be easily seen and observe.
I am sure a lot of billionaires are investing n bitcoin because everyone wants to increase its wealth and bitcoin is the best and fastest possible way to earn and I and contradicting with your one statement that one of them is controlling bitcoin mate bitcoin is uncontrolled and no one can control bitcoin because it depend on its community spread all across the world and no individual can control bitcoin single handedly.