Why didn't the creators of Bitcoin just give everyone in the world 10 free BTC at the very start? They were worthless in the beginning, so it would have cost nothing. Why couldn't they set the max number of total BTC to maybe 50 or 100 Billion and just send 10 free BTC to every email or IP address in the world and let people decide if they wanted to keep them, throw them away, give them to someone else, trade them for something and so forth?
There was many faucets giving away large quantities of bitcoins during the early days. Of course with the price over 1000$ thats not possible anymore.
Also if they started sending bitcoin in mail addresses those bitcoins would have been lost by now.