Just wondering because buying BTC when it was next to nothing or less than a dollar and then seeing it grow to like $100-$500 and more, I have a feeling that they would have sold a significant part of their hodlings to cash out on the profit over the years.
Well, we cannot be sure about it. But I guess it is still very much possible, especially to those who really believed in the project and was able to hoard a good deal of Bitcoins earlier. For sure, these early believers of Bitcoin have already dumped some portion of their holdings, but because they own so many of them and upon seeing that the future of Bitcoin is still very much brighter, they must have some remaining Bitcoins. But if we have some of these early birds' addresses, we can easily check them through the blockchain.