It can be seen that at that time, people were quite open and did not hesitate to share the bitcoin they had, maybe because bitcoin at that time did not have too much value. But now each bitcoin is worth almost 70 thousand dollars and I think it would be unwise for us to publicly disclose the number of bitcoins we hold. It's not just privacy but there are many different reasons that I believe we all know.

70k$ is not a small amount of money for many 3rd world countries and I think many of us will not have many holders above 1BTC, IMO. Not to mention, today's market is not just bitcoin, we have hundreds of thousands of altcoins and I think the majority of people will invest more in altcoins instead of just holding bitcoin.