There should be an algorithm implemented in lichess, which punishes people, who leave the game because they are simply losing.
In order to avoid punishing players who have connection problems, this algorithm could be implemented in such a way that it only applies when there is a GOOD connection for someone who is not making a move anymore.
My suggestion for the punishment would be that such cheap players (1) get twice or three times negative points and, if happening about the fifth time within a week, that they (2) wont be able to play games for 3 days.
In order to avoid punishing players who have connection problems, this algorithm could be implemented in such a way that it only applies when there is a GOOD connection for someone who is not making a move anymore.
My suggestion for the punishment would be that such cheap players (1) get twice or three times negative points and, if happening about the fifth time within a week, that they (2) wont be able to play games for 3 days.