Isn't it strange that someone sends all those coins to one address? That is, if I do not want to make a fuss, I will divide coins into smaller addresses and so on.
Anyone who wants to transfer Big amount like that aims to make a media fuss about it. Perhaps manipulation of prices or any other purpose, but is a known party/exchange/person/company and not anonymous.
Whales like to do this often, they move around huge amounts of coins so people think they are being dumped on the market causing the prices to crash and then they can pick up more cheap coins
I suspect that one of the top 10 wealthiest people in the world hold at least 1 billion dollars in bitcoin. Maybe Zuckerberg