When I started learning coding I had to write my C code on paper and have it sent by mule to the nearby city where the only computer in the area existed. Only a week later I would hear back the result of my programs.

I assume you’re joking, but I have a Cuban acquaintance who actually did something like this. He did everything on paper and even won a national coding competition without ever having actually used a computer. Of course, as soon as he had the opportunity to leave Cuba, he left for good.

I vaguely recall a service in the 90's where you'd write HTML on paper and mail it to them and they would make a website for you...