Most of the design work I've created in the past 20+ years — apps, websites, software — has disappeared. Vanished. Never to be seen again. If I had to guess, I'd say less than 5% is still around.
Design in the digital age is fickle. I'm certain that all or nearly all of my work will be gone just a few years after my last project has launched. I'm okay with that.
I don't mind making things that people use for just a moment. It's design that's meant to be consumed and forgotten. The lasting artifact, if any, is what my work helped them accomplish.
Did my work help someone learn something, or complete a meaningful goal? If so, then those short-lived pixels were put to good use.
I'm not alone, by the way: all digital designers, which is most designers today, create ephemera, work that's so transient it disappears the moment the power goes out or someone forgets to pay the hosting bill.
It's okay. Let the pixels die. But before they die, make sure they lived well.