I think many people own Bitcoin more than 100,000Bitcoin, but they are probably making a profit by controlling this market silently. Many Crypto billionaires do not reveal their identities because they know that this can be dangerous to them and that they can become the target of criminal crime.
Anonymity is essential to many big and small players for a variety of reason. Becoming victims of crime, hacking, abductions or stings is probably top of the list but there could be many reasons why people do not announce their holdings. If I were a whale I would keep it quiet and not announce it to the world.