You’ve very much got some survivorship bias and distorted facts here. It’s easy to look at PUBG, Minecraft, and Stardew Valley then assume that a one-man show that’s good enough will naturally sell a million copies. The reality is that those are exceptions with their own unique stories, lots of embedded marketing/existing following, and “right time right place” luck. You don’t see the mountain of great, but failed indie games that creators worked just as hard on.