Evil hack that prevents user from inspecting web page

prevent_dev_tools.js

function check() {
  const minimalUserResponseInMiliseconds = 200;
  console.clear();
  let before = new Date().getTime();
  debugger;
  let after = new Date().getTime();
  if (after - before > minimalUserResponseInMiliseconds) {
    document.write(" Don't open Developer Tools.");
    window.location.reload();
  }
  setTimeout(check, 100);
}

check();

window.onload = function () {
  // prevent right click to open context menu
  document.addEventListener(
    "contextmenu",
    function (e) {
      e.preventDefault();
    },
    false
  );
  // prevent dev related keyboard shortcuts
  document.addEventListener(
    "keydown",
    function (e) {
      function disableEvent() {
        e.stopPropagation();
        e.preventDefault();
      }
      /* shortcuts for open dev tools */
      // both windows & mac: F12
      if (e.keyCode == 123) {
        disableEvent();
        return;
      }
      // windows: ctrl + shift + i
      if (e.ctrlKey && e.shiftKey && e.keyCode == 73) {
        disableEvent();
        return;
      }
      // windows: ctrl + shift + j
      if (e.ctrlKey && e.shiftKey && e.keyCode == 74) {
        disableEvent();
        return;
      }
      /* shortcuts for open/save source code */
      // view source on windows: ctrl + u
      if (e.ctrlKey && e.keyCode == 85) {
        disableEvent();
        return;
      }
      // save page as. mac: cmd + s; windows: ctrl + s;
      if (
        e.keyCode == 83 &&
        (navigator.platform.match("Mac") ? e.metaKey : e.ctrlKey)
      ) {
        disableEvent();
        return;
      }
    },
    false
  );
};