I think you're misunderstanding the original point then
It definitely is a wealth extraction industry. This however doesn't mean that it shouldn't exist.
even in the best case scenario of the bank financing someone who starts producing products which he sells.. the banks job will only be to extract as much money they can get from this person.
As such, they're not producers.. they live off of them.
Nonetheless, there'd be less producers without the banks (at least short term), so they're also enablers. This makes them valuable. But still, they earn their money by extracting the value of someone else's product.
Which is fine if everybody is a willing participant...
