Eventually, he vanished when his WiFi connection abruptly cut out and ended the stream

He didn’t and it didn’t. He experienced lag, but he stopped playing before his character died on screen. He could have very likely survived if he continued any movement input. The stream didn’t cut out abruptly, his video remained clear and he spoke before ending it manually.

He was upset about the incoming messages and used the lag as an excuse to log off. He was willing to blame his own product rather than spend one more moment on camera. He’s a weak little man who craves the validation of gamers and internet strangers and absolutely cannot handle being bullied.