What adds oil to the flame is a bunch of "game templates" that you can buy and make your own game just by replacing the title screen and some models. E.g. https://assetstore.unity.com/packages/templates/systems/stor...

And if you open Steam games and go to the newest, you see that nearly half of the releases is some version of a generic Unity/Unreal template game in a slightly altered "skin":

https://store.steampowered.com/app/2488370/Cash_Cleaner_Simu...

https://store.steampowered.com/app/2073910/A_Webbing_Journey...

https://store.steampowered.com/app/3498270/Better_Mart/

https://store.steampowered.com/app/2625420/Drive_Beyond_Hori...

https://store.steampowered.com/app/3163790/Toy_Shop_Simulato...

https://store.steampowered.com/app/3023600/Horse_Farm_Simula...

https://store.steampowered.com/app/3124550/Liquor_Store_Simu...