Sims Earn Zero LP
A simmed game earns 0 LP for both teams. No LP from a sim against the CPU, no LP from a sim against another user, and it does not matter who was at fault.
LP rewards participation, not arguments about participation. If LP were awarded on fault, the system would become about who can build the best case rather than who got on the sticks and played. If the game was not played, there is nothing to reward.
There is no fault-based appeal. There is one correction, and it is a data fix rather than an appeal: a game you genuinely played that got marked a sim by mistake can be flipped back, and the LP returns.