One interesting comment about the third point is that once a channel gets sufficiently depleted (say down to 10% of the balance on one side), then there is an i

One interesting comment about the third point is that once a channel gets sufficiently depleted (say down to 10% of the balance on one side), then there is an increased incentive to cheat (because the potential losses are lower). So you will usually have to keep channels at above a certain balance for security reasons.