The value of the "this" keyword inside an arrow function in JavaScript is determined by the context in which the function was created, rather than by how it is called because arrow functions were designed to have a lexical "this" binding. This means that the "this" keyword inside an arrow function refers to the "this" value of the surrounding scope, which is the scope in which the arrow function was defined, rather than the scope in which it is executed. This makes it easier to reason about the value of "this" and provides a more consistent behavior for functions that are passed as arguments or used as object methods.