"share their bank data with other parties"
What? Who wants to share their what now with whom? Why would they do that?
"Fintechs like Plaid, TrueLayer and Tink have founded their businesses on providing access to regulated banking data for a fee.."
What data? Aggregated? Individual banking? What regulated data? What regulations?
"Under current banking regulation, raw data must be provided for free to consumers via an official application programming interface (or API). As a result, the apps pick up the cost on behalf of their users."
What? My bank doesn't offer an API. I have no idea what that last sentance even means. What cost?
It really seems like the article assumes a lot of background knowledge. Anybody have an ELI5 link?