Andreas here said that there are no incentive to become a huge hub because you must keep your private keys with a lot of fund exposed.
https://www.youtube.com/watch?v=D-nKuInDq6gthen he said (min 8:28) that LN tends to rebalance with some tecniques, if use route just in 1 direction and your balance is gone, then ln tends to rebalance using route in opposite direction.
seems that ln automatically open new channel. Someone can explain me this better?