Also, it had dirt-cheap hosting, as a single process could host multiple sites (though it did come with some security implications). Nowadays we tend to bring

Also, it had dirt-cheap hosting, as a single process could host multiple sites (though it did come with some security implications). Nowadays we tend to bring up a whole virtual OS. An interesting direction in this area might be GraalOS, which might allow running multiple applications in a single OS process, doing the necessary isolation itself. (Not affiliated)