> Alas, this flag only prevents video that has sound from auto-playing. It’s the inadequate option that my earlier comment was referring to.
> Here’s more: https://www.chromium.org/audio-video/autoplay
> Quoting the blog post, Google’s decision that ”Muted autoplay is always allowed” is the problem. If any other Chrome users wondered why videos now auto-play without sound (even with this option set), at least based on the relatively minimal docs about this flag, this is why.
Set the flag to "Document user activation is required", restarted browser, went to youtube, videos autoplay
Ditching Chrome is another excellent and recommended option.