this means about 1 million people own their own key. we can track it if their Bitcoin is put in exchange, right?
this does not mean 1m people own 1btc each
it means whales are splitting their funds up from being a whale address of 10k coin on one address, to being 10k of addresses of 1btc each
yep one whale has MANY KEYS
EG alot of people think Satoshi has 1m btc in one stash.. when in actual fact he has thousands of addresses of 50btc
many people use "seeds" now, whereby they have thousands of addresses all funded with small amounts each
..
what you can also notice is that the count was only temporary. becasue the amount of addresses holding more then 1 BTC has died down again
whats seen is the whale holder of mass amounts have now dropped to small holdings per address.
also what you can now see is now there are many many millions of addresses holding under 1btc. because yep you guessed it the main whales(exchange custodians) have split their hot wallets into smaller amounts per address and many users of even smaller amounts have withdrawn. so temporarily it caused alot of temporary addresses showing lots of 10k btc+ becoming lots and lots of 1k addresses and lots and lots of <10btc amounts.. but this was just wallet shuffling of many addresses per wallet
and now its settled down showing less coins on exchanges
this is due to things like binance doing a temporary withdraw close while they mess with their wallets.
in very short version:
a significant of the addresses holding 1-10btc are exchange custodian hotwallets yet to sweep or withdraw balance
a significant of the addresses holding 1-10btc are whales not wanting to have more then $250k of value per address
meaning alot of those addresses are owned by the same individual. thus no where near 1m individuals