I was dubious while doing it - and I gave Plaid access to my settling account. I consoled myself that they wouldn't have by income, but then realized they had a copy of my financial information on spending, which is equally bad, or worse than just income. I ought to have been more vigilant - I unfortunately fell into the trap of thinking that banks are slow-moving and reluctant to develop API access.
I will never sign up for a service that requires Plaid.