A decade and a half of instability: The history of Google messaging apps … Google seems content only to spin up an innumerable number of under-funded, unstable side projects led by job-hopping project managers.
I’ve watched XMPP-based Google Talk, Google Hangouts, Google Plus and now Google Chat and Meet march by in my Gmail sidebar. Never even bothered with Allo and Duo.
(But hey, ICQ is still around.)