Good news, though! Looks like we can use detect users on a metered connection with `navigator.connection`, or worst case look for a mobile user agent. Thanks for the feedback!
It seems to be done as a demo right now. Why not just add a big red "click here for a demo" thing?
There are very few things that you can reliably find out over the web. Whether or not a connection is metered isn't one of them.
Please don't. There's nothing special about mobile devices that inherently makes them metered, so please do not assume this.
It would be better to use a manual approval rather than a automated detection.
When I visit youtube, I know that the video is going to start immediately but that wasn't the case with this.