Aw man, I could write an entire book on the darker consequences of the internet! For brevity's sake, I'll just mention that the worst aspect that was born out of the internet was....The Dark Web..... cue the ominous music... Even scarier is, it was born very soon after the World Wide Web became available, but nobody mentioned it until recent years. It's like the evil, dark twin of the internet, and thankfully, is not available to more than the few who know about it. Heck, the only way you can get in is by downloading a very specific browser, but I wouldn't. It's seriously not worth it. shivers
I can honestly say, after reading about it online, that The Dark Web totally goes under the phrase:
"One does not simply walk into The Dark Web."
There's also cyber terrorism, which society is vulnerable to given the degree to which everyone has become dependent on the Internet.
I remember reading about that. I'm afraid that war has been going on since the internet started too, but nobody outside the govt. and certain fringe groups was aware of it until the big breaches started happening in recent decades.