Youtube and Soundcloud's content ID engines effectively killed the genre of mashups. There was a pretty vibrant community with a lot of new artists on both, with rooms on plug.dj and even turntable.fm back in the day. Then the content ID engines hit and one by one every mashup artist (with the exception of girltalk) had their work taken down by poor fingerprinting. It was such a massacre we took to making http://mashup.fm which used youtube-dl to cache everything locally, but by then it was too late. All the artists stopped creating content because they didn't want to be permabanned from these huge services.
I worry what by-catch Microsoft's engine will leave in its wake.
I hate this. There really should be a setting in browser so that I don't allow sound from any website unless I explicitly click the speaker icon in tab bar. Annoying as hell.
If you use Firefox, go to about:config and set "media.autoplay.enabled" to false. A few web sites throw a fit when they can't autoplay, but that's a price I'm willing to pay.
I worry what by-catch Microsoft's engine will leave in its wake.