Can an Indie Developer make GTA6? What about a piece of it?

Indie developers can't replicate massive games like GTA 6 or Skyrim, but they can extract a single mechanic or mini-game and build an entire focused game around it. Examples include making a standalone heist game, a police simulator, a helicopter driving game, or a boss-fight-only game (like the indie title Fury). The core advice is to reduce scope to the bare essentials of one compelling mechanic from a large game.