Earlier quoted context omitted.
Block by default, and not ask by default? That seems unfortunate to me, and will definitely break one of my services for Firefox users. I have a site which coordinates watching videos amongst a party of people. To the browser heuristics it looks like "autoplay" (the host starts the video manually, and some scripting on the page kicks it off for everyone else and works w/ the backend to maintain something resembling s…
"I realize autoplay gets a lot of flak due to large corporations using it to further their aggressive marketing campaigns" Not just because of that, although that is the most egregious example. Personally, I find any autoplay at all to be objectionable. It doesn't matter if it's an ad, a YouTube video, or anything else.
If useragents remove my ability to start playing content on behalf of my users (who have already agreed to that by clicking past the event banner) then my service will have to move to a non-web platform. Though we have a difference of opinion hopefully you can see why I find that prospect to be distressing: I love the web, and I hate to see it effectively sunsetting my application.