If you’re the one hosting a file on the network, it’s as easy to delete it as cleaning your cache / stopping hosting it. Folks might have the “address” for your file, but they won’t be able to access it if you aren’t hosting it. Now if someone /else/ has the content already, you can’t take it away from them and delete it off their server - so same model as the web already has (just without central players in control of these decisions, and the useful ability to still find content even if the original host changes)
