Countless of these "services" can simply vanish overnight, stealing your coins. It has happened many times in the past and will continue happening in the future.
That is the reason I like the conventional bank to adopt the bitcoin and offer service based on the bitcoin.
I think if bank will adopt bitcoin the price of bitcoin will stabilize or down because banks and government will manipulate it for their own good even do bitcoin is free for now maybe it is good to the bitcoin to be anonymous and no bank should hold it. Maybe its ok to us to remain their because we earn already by its flow.
When many banks adopt the bitcoin and it becomes a global currency, it is difficult for several governments to manipulate.