@cashcow8 as i am writing this lichess has 42500 games in play if we times that by 2 for each player thats 85k players
now if the server was to receive 85k pings a second it would spontaneously combust hence why lichess does not do it
Now for the point about the player staying on the tab the whole time does not matter because the punishment is not for people who rage quit or rage sit but for wasting your opponents time difference being regardless of intent you still waisted their time and lichess wants people to play games not to have to wait. (i understand it could be your, lichess or third partys fault for the internet problem but punishment is not because of the action rather the effect)
for server restart people are warned 15min in advance and the problem is during a restart basically everything is restarted making a second instance impossible