Dear web developers,
The answer is zero. Zero. Get it through your thick skulls. Zero is the number of times anyone has EVER wanted something to autoplay on your site and start making noise. I'd honestly rather you mine crypto-currency in my browser than use my speakers.
#kthxbye
Devs aren’t the ones you need to convince. I worked on an ecommerce site and was strongly against auto playing videos but A/B tests showed we made more sales when the videos auto played so they stayed.