"Web prompts are one of the most effective ways to easily grow your audience" > I completely disagree; in my case, probably the most effective way to make me lose interest in what you do, instantly.
"Follow up with visitors who initially dismiss your prompt." > In case you didn't leave first time, we are giving you a second opportunity to close that tab and never come back again.
Visitors who actually want to get notified from you will find the way to do it without the need of a popup harassing you to provide personal information.
Anecdotally I see it in relatives that they're often hopelessly at the mercy of what their screen says. This is who gets targeted with this nonsense.
Hopefully we'll be able to be more intelligent about this to accommodate your preferences, but for now we're building for to empowering our customers to decide how to engage their users.