Hello! Items labelled as “junk” are useless, and only good for selling at The Ppwn Shoppe for income. Deliveries from fans will only ever contain junk items.

However, you can also sell useful stuff: equipment, moar files and consumables. Although you’ll see them listed on the “Sell my items” screen, those are items that you’ll have bought yourself or received from NPCs.

In the case of the web spider, for me, it’s labelled as “Web spiders” on the von Neumann store front, not junk, and it doesn’t appear in the “Sell” section of The Ppwn Shoppe for me to sell, so you might have misunderstood something there.

tl;dr, junk is just junk. Hope that helps!