I have premium and I have received emails regarding the family plan, not popups. And honestly I want those emails because the family is a fantastic value proposition. Too bad you only get 3 custom domains to share with 5 other people, that is really not enough :/
If they ever change it to at least a domain per person I want them to email me about it.
Emails, opt-in are fine yeah. I don’t mind the little Special offer button at the top either, it’s just the pop-up when I’m just trying to check my mails that is really intrusive.