Why would anyone in their right mind try (or even want to try, except as a lark) this? "...The input of Hastlayer can be a program written in dozens of program

Why would anyone in their right mind try (or even want to try, except as a lark) this? "...The input of Hastlayer can be a program written in dozens of programming languages (including several of the most popular ones as C#, C++, Python, PHP..."