Plaid is pretty clear in their privacy policy that they DO NOT repackage and resell data (they do sell data - as in, when you use Plaid to give your banking info to a mortgage broker, the broker is paying Plaid for your data, but it is at your explicit request).
If banks didn't want Plaid to do screen scraping, they could build APIs. Some are now. But they've been VERY VERY reluctant to do so, because they want to hold customers (us!) hostage to their services and make it painful to go anywhere else to get financial services. I appreciate that Plaid figured out how to break their stranglehold, which has directly enabled the current blossoming of FinTech apps ... even if they had to do so in a way I don't love.