Comment by cataflutter

Disagreed; it's not a download you'd expect and it's also at least an order or two of magnitude than you'd expect to find reasonable for browsing a page.

I have a 2GB mobile data plan. If I was using Chrome, then some site triggers the Prompt API, that will cause Chrome to not only wipe out my data plan, but need 2 of my data plans. I don't find this reasonable.

This is exactly a consent problem, because I'm not denying it might be a useful feature, but it should be at the user's own informed choice. The fact that Chrome developers don't appear to see this might be due to them living in a bubble where they've never had to think about the costs.