Even in Europe and UK, most of plans have some kind of top, whether download or speed. I don't think auto-updating is a good idea. Saying that other operating systems do it it's not a valid argument. Windows does a lot of c**** and it would be a very bad idea to copy it into Fedora.
The point of using Linux systems is keeping control of your own computer, if everything will be hidden and automatic without even a warning or a prompt... the whole point is lost.

My thoughts,

On Thu, 2017-04-06 at 16:20 -0700, Adam Williamson wrote:
On Thu, 2017-04-06 at 16:45 -0600, Chris Murphy wrote:
Maybe a wifi connection login dialog needs a checkbox to indicate whether it's a metered connection. Because however it's supposed to work, isn't reliable in the real world.
Yeah, this is basically my conclusion. I strongly doubt it'll ever be possible to achieve an acceptable level of magic detection here. Even connections that aren't *tethered* could certainly have data transfer caps for one reason or another. Just assuming you can go ahead and download as many GB of updates as you like without any kind of prior warning or even notification while the download is ongoing is a really bad idea.