Even Netflix doesn't work that way anymore. You subscribe to Netflix to get access to Netflix original content. Licensing the entire universe of video, even if

Even Netflix doesn't work that way anymore. You subscribe to Netflix to get access to Netflix original content. Licensing the entire universe of video, even if you just limited yourself to only licensing from the biggest studios, became prohibitively expensive the moment the studios realized there was an actual market for online streaming and stopped charging peanuts for streaming rights. I suspect a news aggregator that provided access to "most content on most major websites" would rapidly hit the same wall; just licensing content from the five biggest U.S. newspapers would require a higher subscription rate than most people would be willing to pay.