I’ve experienced it originally where the mute switched wasn’t configured as an option for apps to use it to determine sound output. I understand this is a “feature” and I’ll admit I don’t mind it since I have yet to unmute my iPhone’s in the last couple years but I can understand the confusion. The mute switch enabled doesn’t stop music, YouTube or other media from playing sound. Instagram doesn’t cut off sound because of the mute switch being on either, granted they have the option to not play sound until you tap but even with that off the mute switch doesn’t affect this. I think there should be a setting for this somewhere so the end user has control and not hidden to just the app developers. Snapchat is generally an intended use so it would be nice to have a defaulted choice to not have to fumble around trying to get sound back on. I’m aware just flipping the switch before playing a Snapchat is a simple fix but it’s not a true solution to this “feature”. Some apps don’t abide by this even though this whole thing was introduced to bring down disturbances in environments where surprise sounds could disrupt the user or others. There is no give on either end of this dilemma and still the only temporary fix is to make sure the volume is set to off through the control center, I’m hopeful for a default choice for this one day. If I missed it though please let me know it would be very useful.Mute switch prevents sound, who knew.