I literally can't log into the Amtrak Android app unless I have Chrome installed. It strictly relies on Chrome custom tabs. Other browsers that support custom tabs don't work.

I cannot imagine any reason for this except sheer ineptitude.

Guess what Amtrak support told me when I reported this as a bug?

That's what we thought about VBScript, and Active X and Shockwave Flash, and Silverlight, at different points in the history of the Internet.

Adobe and Microsoft have both wrecked hard (at their peak) in their attempts to close and DRM the Internet.

Looks like it's Googles turn to find out if they have the clout to manage it.