Another comparison would be FreeNet, also where you don't get paid anything, but you don't know what's on your particular hard drive either.
With FreeNet though, you can anonymously post and distribute content to others. I didn't see anything on the page or FAQ indicating if you could create a public key/link (like you can with Mega).
With FreeNet though, you can anonymously post and distribute content to others. I didn't see anything on the page or FAQ indicating if you could create a public key/link (like you can with Mega).