4) The banks use of blockchain tech validating bitcoin
Private blockchains are actually a mockery of bitcoin. Banks want to rip off blockchain tech to create nothing but glorified database.It won't be more secure that their current servesr in the basement, but they want to have mumbo jumbo PR note to boost their credentials among general public:
"Look we have this new tech, taken from bitcoin, it is impenetrable to attacks." In the meantime they won't give bitcoin a single credit.