1 wallet holding a lot of coins != 1 person holding a lot of coins. I think it's most likely that this is a storage wallet for a large exchange.
You can't tell that transfers into an address are done with the consent of the address owner at all, or that they represent "buying". The only activity that is provably initiated by the address owner are the transfers out, and none of those are meme amounts. In fact they're all to a single wallet. Probably the exchange's hot wallet.