I have only my memories of them, and you don't even have that.
Or think about all the *Amazing* artists you knew on Tumblr who have completely disappeared, and taken their archives with them.
How many of those artists still even have copies of all of that work?
And, unlike in years past when, in order for something to stop existing it had to actually be destroyed, today things can just stop existing with the click of a button.
There aren't any physical artifacts tied to their existence.