Hahaha, I feel so stupid!
I've created Flows before, and I've used dynamic contents a lot of times ... But I actually didn't notice the blue pop up at all when it appeared .... Well, lesson learned: take a look around on the screen before asking noob questions 🙂
Thanks!
(However, "Created by e-mail" subscribes the "e-mail of the person that created the SP list item" to the Mailchimp list. With "E-mail" the "e-mail address entered in the E-mail field" gets a subscrition ... I think, but I know better now than to say for sure)