Related: Mods that Add Sonic the Hedgehog to Other Games
If they’re not making indie games, they’re experimenting with ROM hacks and fan games. Nowadays, they tend to get into software development in more typical, boring ways.
‘Bedroom coders’ became a fad, especially in places where microcomputers like the Commodore 64 were big. Once upon a time, tech-savvy kids could code their own games, sell them to publishers, and enter the computer world that way.