What do you mean it's impossible to get access to?
If you're a start-up wanting to share your customers' financial data, you can make an API.
If you're a start-up wanting to get access to your (potential) customers' financial data from other institutions, you can get access through one of the many providers (Tink, GoCardless etc), or become a provider yourself with enough work.
What am I missing?
(the mostly useless open banking stuff is however due to PSD2)
In the article, Griffin is described as:
> Their services allow Fintech businesses to integrate banking features quickly and securely.
So this is about integration with other FinTech businesses, which I think squarely falls under open banking and PSD2.
I'm not sure why you describe PSD2 as "mostly useless". Did you vote for Brexit by any chance?
That's sad.
I'm not here to engage in flamewars, so let's just leave this here.
no, only the mandated banking API (which is impossible to get access to if you're a startup or an individual)