There is a famous British cryptographer called Adam Back, who is also the inventor of the proof of work method laid out on the paper “hashcash”. He also leaves two spaces after a period (or used too)
I don’t think it really matters who created it. If you read the political story of bitcoin things look a lot clearer.
“The Blocksize War: The Battle Over Who Controls Bitcoin's Protocol Rules” is a good entry point
So did I, for a long time, because I was taught that way in typing class. And so were millions of other people. It's how it was usually done on typewriters. It supposedly made the text easier to read.
It has fallen out of fashion now. I eventually switched to one space once I realized things were going that direction. I'm not sure if I had switched by 2009.
So I think this just tells you that Satoshi is probably old enough to have been taught the old rule.
Like when I learned most kids can't read cursive anymore. Or that, for a long time, my use of "emoji noses", :-), really dated me (and I still think it looks better with a nose than without!) So I admit I had a similar chuckle with the idea that putting two spaces after a period was a unique characteristic! Even well into the PC era, 2 spaces was the norm before proportional fonts became widespread. And I still had a heck of a time moving to a single space because it just looked so weird to me.
And Bitcoin ABC.
There are so many to chose from.
BSV: completely removed any concept of a tx spam cap and encouraged use of its blockchain for random data storage. Neither of these are things Satoshi supported. Its spiritual leader is also a charlatan.
XEC: changed both the mining algorithm and added in a "dev tax" on block rewards. The dev tax in particular is something I don't imagine Satoshi would have supported, or he would have added it himself from the start.
But to each their own.
(I still do it, too, and mine is also there.)
Plus, the use of "colour" (with u) and reference to something as "rather Neanderthal"
Just, no.