This is false. Nearly 100% of the assets from Dota 1 came from Warcraft 3.
I am not familiar with the other games to know how much original content there was, but I remember that both CS and TFC used a number of assets from the original.
Source is not free. Saying Unity is free and Unreal is cheap completely ignores the cost of modeling.
I am not familiar with the other games to know how much original content there was, but I remember that both CS and TFC used a number of assets from the original.
Source is not free. Saying Unity is free and Unreal is cheap completely ignores the cost of modeling.