I came across a topic asking if people can really change their name to Bitcoin for 200btc
hereand my answer was yes speaking for myself.
That very topic reminded me of an issue my brother had as he was scammed of $2000 worth of BTC but we had to track the transaction using the transaction ID on Blockchain and when tracked, we finally found the coin in a wallet containing over $600m(36754.6) worth of Bitcoin after several transactional movement.
My questions~Are there private individuals who own and posses such amount of Bitcoin?
Look at the image on that thread you linked and read the message. That incident took place 12 years ago, and Bitcoin is now 14 years old. As of then, 1 bitcoin was not even worth $100. From records, Bitcoin reached $1 for the first time in February 2011, and in 2012, people saw the price at $12, less or more. So I assume such an offer could have only been made then and not now.
You can say yes, but believe me, nobody will offer you 2000 bitcoins now just to change your name to Bitcoin.
I guess it is not a private individual that has such a large holding but rather a company that deals in bitcoin like the forex companies, a CEX, or a casino (as also mentioned by Dave1).