Oh, no kidding about harm a demon could do in the internet, such as changing children's education sites into filth sites for instance, or transferring all the security codes to terrorists for another, or both for crying out loud.
When in the television show Giles said that there's a demon in the internet, I was like "Oh, only one? This should be easy!" as in I'm sure there's an awful lot of stuff online that's demonically influenced at that, especially on the Dark Web.
Now *there's* an idea: Willow stumbles upon the dark web and goes for a stroll, only to find it's far darker than she ever wanted to imagine!