I am fairly sure that billionaires invest in Bitcoin and other crypto's, but the thing is that they prefer to remain in silence, out of the publicity.
It has always been like that ~ the most wealthy entities remain in silence when it comes to investments and gains, where others (e.g Kim Dot Com, Max Keiser) start being loud for no reason.
Yes, I agree with you. The billionaires are also one of those who are involved in the game in fact they are the people who manipulate the market because of the strong holdings and beside they keep silent and dont make any noise. When it comes to earning everyone from the society wants to gains from it if it is a billionaire or a beggar or a middle working class person.