The errors I've seen with some startups is that they rely on the unsubscribe mechanism of the mail sending platform, but then they use their customer-base emails across multiple mail sending platforms (and obviously people unsubscribe from one but they remain subscribed on the others).
Hopefully it's not the case here with Stripe (fingers-crossed)
I’ve seen this go badly in the other direction too. Customer unsubscribes from a marketing email, but then is unsubscribed across the whole mail sending platform causing them to not receive critical updates about their account. I sadly believe that email notifications are a part of UX that is often forgotten yet always creates so much friction when done poorly.
Hopefully it's not the case here with Stripe (fingers-crossed)