This is not new as we have seen in the past that people who have funds and prefer to invest in Bitcoin have already spent billion in Bitcoin investment.As said above by one of member that this bulk order was not individually placed so it is clear that it's combined output for all individuals on coinbase.Even if it was it would be simple news these days.Tesla invested $1.5 billion and bought 48000 Bitcoins in their custody.So it is just a little amount for billionaires to invest some portion in bitcoin as they are always ready to invest in high yielding assets.So don't be jealous of other investments but be part of Bitcoin with any amount you can afford to invest.