The Internet is a Schrödinger device.
On the interweb, after a while, things are simultaneously there and gone. They might be there, or they might not, depending on some earlier random event.
On Kindle, when we look in the box, we see the book either there or gone, not a mixture of there and gone (just like the cat).
For webpages, they too are either there or gone – sometimes they even stay there long after they’re gone.
There really is no way to predict which it will be until we look.