Citation needed. Plenty of games get picked up and become popular organically. How much did they spend on Minecraft's marketing? Fortnite? Factorio? KSP?
Most of your examples first popped up 10 or so years ago give or take, when organic reach was still possible. The only one that didn't was fortnite (Dec 2017) but it's a far cry from a small indie project, it came from a AAA developer that not only had multiple well known games, was also behind the unreal engine, one of the most popular game engines.