Well, this fixed it. I bet there is a lot of confusion for the people reporting it just works, while their phone is on silent. Seems to work on silent if you have headphones on.
Having thought about it, it makes sense for the web browser. Though I think the app should do something to bypass it, but I realize it is probably just a browser embed.
I peeked at the source code and it’s pretty wild to see this is what JavaScript can do these day.