Earlier quoted context omitted.
This is what I imagine. People try to kill it, but there’s thousands of googlers using it and it’s harder to make it internal only than just to keep it running. So every time someone tries to kill the project some fancy pants google person kills the idea because it personally inconveniences them.
This logic doesn't make sense considering how many Googlers used Inbox and Plus and so forth. I imagine they don't kill it because their ads feature where you can click to call the advertiser uses the same infrastructure. It's the ultimate sales conversion tracker.
Inbox had a pretty easy substitute as gmail was still around.
If Voice goes away there’s nothing else googlers can use, even at reduced functionality.