Having 1M BTC in one single wallet (n enclosed addresses therefore) would be equivalent to currently owning 5,35% of all existing bitcoins to date (some 18,7M). [...]
It is quite possible that either Jeff Bezos or Elon Musk is hiding behind the nickname Newlifebtc, since no average statistical millionaire
(not to mention you and me mere mortals) will think that 5%
($ 60 billion .. lol) of all existing bitcoins is a small amount.
As for Satoshi's million
BTC, in addition to pooya87's rather reasonable answer
[there is a difference between "wallet" and "address" in bitcoin], I also came across one rather logical assumption.
the main assumption is that everytime he debugged his client and updated it, it created a new wallets/files and be didnt back up the previous
take this quote that shows early versions needed backing up entire folders,
(imagine backing up a folder every time you edited a line of code).
4. What files need to be backed up for not losing my "money"?
Version 0.1.5: backup the whole %appdata%\Bitcoin directory.
Version 0.2: you can backup just wallet.dat.
It was just a experiment back then so there was no value in keeping the private keys ... assumptions were that after a few months of bug fixing everything would be reset and born again
(but too many joind and it instead just continued to live and it wasnt until 2010 before h made it simple to backup).