Instagram in particular is the worst offender:
- Stories on the web are always muted. Always. And there's no seeking so you can't easily restart the video after unmuting it.
- On the contrary, in the Android app, if you unmute one video in your feed, you're actually setting a global "sound is unmuted" flag, so that when you encounter another video 10 posts later, you get startled by it autoplaying with sound.
- In the app, if you have the RINGER set to silent, stories are muted. WHY TF.