You can long-press to have it always off for a site too. If you have a Mac, you can configure Safari there to default to a setting, say using reader mode autom

You can long-press to have it always off for a site too. If you have a Mac, you can configure Safari there to default to a setting, say using reader mode automatically or autoplay videos. It seems these settings are shared with mobile Safari. And then you can override these settings per site in Mac Safari, and only the reader mode setting in mobile Safari. A bit weird that you can't do it all in mobile Safari, it doesn't feel finished.