We know why they're investing billions. Same reason they invest billions into start-ups - their capital gives them preferential terms that let them cash out at the expense of other investors, whether it be at IPO, or ICO.
I'll dismiss claims that it's a massive shift in society until it actually... causes a shift in society.
Unless you consider "A new way for grifters to run ponzi schemes" a societal shift, then there's no evidence of any alleged shift, nevermind a massive one.
But you choosing to believe that it is indeed a massive shift in society, well, that's on you, but more likely, that's _from_ you. You want to believe.