[imchillyb]

Inbox was a data-gathering nightmare for our 3-Letter spy orgs.

Inbox wasn't killed for lack of users.

Hangouts, Inbox, and most of Google's prior messaging platforms were terminated due to lack of centralized data-gathering of the most important data sets.

This is old news though.

[xmprt]

Inbox was pretty much just a new frontend to Gmail. Why would it impede in any data-gathering if that was Google's goal?