Look at something on Amazon. See ads for the item in many other places. This is annoying if you went ahead and bought it.
Compare: subscribe the to email announcement list somewhere. Do they do something so the website is aware you’re a subscriber? No. You get the annoying sign-up pop up all the time.
Why don’t websites that have an affiliated email list put out a cookie to track your subscription and not offer you the list signup? This is especially annoying when the pop up is full screen cover the content.
This is an annoyance. Not quite as annoying as sites so laden with ads you can’t read the content. Why don’t those folks know if you can’t read the content you won’t return to read the ads?