Not exactly. We perceive time as a constant. Time dilation is only understood in relative comparisons.

For example, you leave and experience one day passing. Did you experience time dilation? You don't know. When you return, you could find that one day passed for everyone else or you could find that one week passed for everyone else.

This can be simulated and doesn't require VR at all. In fact its a common trope is movies, tv, video games, etc. A person leaves and comes back to everyone aged differently - by years or centuries.

A not entirely accurate gun analogy. Boys have a longer barrel so pee more like a pistol, where girls pee more like a shotgun.

You make a site that looked like the original site. But most sites have functionality and forms that are processed by the server.

As an example, I could copy reddit's login page and it would look identical, but I could not actually verify your login, show you your user name, or show you previous messages you posted.

Do not anger the elder gods by trying to discover what lies behind...