Code is not self-executing. I know certain articles can make it seem like it, but the reason code is "self-executing" is really because your program is instructed to "download, read, and follow all instructions at <website>".

If you don't want or need that, you can just make a program that just downloads the page, without running the code. Or you can limit what code it can run.

Like, imagine a really stupid chef. You hand him a recipe and he makes the food. One day you hand him the recipe for a Molotov cocktail, and he blows up the kitchen. The issue isn't the recipe - it's the chef.