How does lichess handle abandoned games? About half the time I don’t even get to claim the early win and i can see the other player is already playing another game
If a player leaves your game, lichess gives like a 20 second timer and then lets you claim victory. I believe there are also "offer draw" options, but I'm not sure.
Chess.com has 60 seconds countdown after leaving a match (at least in 10 min mode, haven't played others that much). Also, in daily chess there is a time limit for every move. Failing to move on time results in automatic resignation