That is a very big question. Publishers are still the main facilitator of scholarly communication and this has been recognised by the gold policies of the UK government. [Under the gold policy in the UK, researchers whose work has been funded by the RCUK, must publish in OA journals to all...
I fear it is people such as you Peter who have fallen for “the hapless drivel of the twits on Twitter” (and other social media, such a personal blogs & diaries…), finding scapegoats to blame for the ills of what you and thise others voted for – from income tax cuts to de-regul...