I'm working on a non-profit project for developers that haven't launched yet and I want to collect emails for the waiting list. I think the value proposition is really, really good - users get deals on cloud/courses/apps and all of the profits from promoting these deals go to research-backed charities.

I have a simple, classic strategy for building the waiting list - publish good content and show a pop up when user is leaving the page asking to sign up to the list. This kind of pop-ups are everywhere because they work. And I think it's fair to make the ask.

BUT. I don't want it to annoy my fellow devs with popups (while still collecting contact info effectively). So here's the question: how would you like to be presented an ask for signup on a blog post?

On scroll, the way substack does it? Mid-content? Any other way?