Is that what that says? I have noticed that every substack page pops up some stupid modal as you scroll down the page and, for the most part, it's made me avoid them when I can because it's just obnoxious. I'm contemplating a Chrome Extension or something that will auto close them but for now I just find that most of the time it's not worth clicking anyway.

I just close it immediately without reading it like the internet has trained me to do with literally every modal. You want my attention? Put some call to action in the text I'm reading. A modal popping up mid-content asking for my email is just a good way to signal to me that you don't value your content and that you just wrote it so you can get my information. And sorry to those folks, I don't even read it.