Wow, great update. Nearly all of my games at itch.io hijacked by browser game hosting sites. I wanted to add some site lock mechanism at first but probably it won't work correctly, plus it will block the legitimate players as well. Also its not big deal for my side, as long as my game is played I'm happy. My only concern was, my connection with the player is cut by some silly ad bloated thief site :) . Maybe player wants to make a bug report or write some comment, but can't reach me.
I noticed I've been getting extra traffic on my itch.io game pages in these days. Mostly from external game hosting sites. So auto site lock update works perfectly, nice work.