Slow down there, Satan. I kid you not, I had someone approach me to help develop technology like this a long time ago. The idea was to break into video streams at the ISP and insert advertising on the fly w/o prior approval.

My reaction, after realizing this person wanted to turn the internet into an ad-encrusted wasteland*, was: "What happens when that video stream is something live with a LOT of money behind it, like the Superbowl?" The legal and professional ramifications didn't even clock with this guy. It was squarely in the "not my problem" category.

(* More-so than it is now. I'm not saying we're getting off light, but this guy was a-okay with making everything look like the hallway bulletin board in a college dorm.)