It'll always be a struggle but it's not something I'm actively pushing for anyone to do. If you're comfortable with it, great! If you're not, I think I'd be the last person to change your mind.
The company is definitely real, but anyone with at least a few hundred bucks can incorporate. Building trust is a non-trivial thing, and I try to do that by putting my name and reputation behind the product and blogging transparently about the journey.
I didn't see anything on the Plaid flow authorizing the ability to charge my accounts or make transfers, so I'm assuming it's only limited to to Transaction data.
Really wish Plaid showed what APIs were being authorized in the flow...