There is money supply replacement theory. In one of satoshi's email, he explained why he chose the supply cap. 21M is a rough number. The exact total supply of Bitcoin is 20999999.9769
BTCFrom: Satoshi Nakamoto <
satoshin@gmx.com>
Date: Sun, Apr 12, 2022 at 10:44 PMTo: Mike Hearn <
mike@plan99.net>
Hi Mike,
....
Ripple is interesting in that it’s the only other system that does something with trust besides concentrate it into a central server.
Satoshi
This is very interesting. First of all the Date (2022?)
And I am impressed that Satoshi is somehow praising Ripple (the company which was founded in 2004, not the cryptocurrency XRP).
Anyway, as I have read in the website you posted we cannot confirm if the email is real, but it is certainly interesting.
he didnt choose 21m btc and then calculate backwards that over X years backwards means the base genesis has to release 50btc
I also agree with this, and it makes sense compared to the email posted above.
He choose convenient numbers, that's all.