I was reading about this recently here: https://www.chromium.org/audio-video/autoplay

Even the strongest setting "Document user activation is required" isn't good enough. It means one click in the page will cause the video to start playing, which is annoying and highly game-able. I don't want a click somewhere on the page to cause a video elsewhere on the page to start playing. Every content site is going to do something to require you to click, like not showing the whole article and having "Click to expand".

I've been using AutoplayStopper and it works wonderfully: https://chrome.google.com/webstore/detail/autoplaystopper/ej...

Once you start using it it's shocking how many (attempted) autoplay videos there are that you never noticed.