But you would be "pushing" the users to provide their data to Plaid, right?

So I'd definitely say don't do it, but the evaluation is on you. How is the fraud affecting you? Are people defrauding your business or is it rather that you don't want to enable fraudsters (as defined by Plaid) to use your platform? What are other options? Thinking outside of the box!

Since you are bank connected solution already, you are already part of the problem of excluding large number of earthlings via KYC. I'm not saying you are a bad actor or that your service is not appreciated, but we also have to be clear about that.