The reason why Localbitcoins is shutting down, because it receive so many complains, because they steal the Bitcoins of some of their costumers. They are too busy with deleting complains in their comments.
From where you came to know that they have received a lot of complaints? I have never and nowhere seen any complaints against them through a lot of complaints stand for the fraud activity of the users of LocalBitcoins. Users made from by reversing their payment and also providing fake screenshots as well as fake messages of the payment.