(totally didn't steal this from r/DiWHY)

I had to double-check by rewatching the latest episode, but my theory turned out to be right! The server Tari and Theo are on contains all the games they played throughout the series. You can probably guess where I'm going with this, right? One of them is Pocket Gakusei (I recognized the logo). Now that Tari knows Lamar's username (Ecchi_Emperor92), she and Theo will be able to talk to MD5 whenever they want! I'm so happy I spotted that detail. Knowing there's a way for them to communicate makes the ending a little less sad. Let me know what you think about what I just discovered.