BlackBerry Messenger wants to be shutting down on May 31, 2019. This announcement came from a short blog post from Emtek (who handles BBM), with the title "Time to Say Goodbye." Somber news, indeed.
It was not too long ago that BBM saw a rebirth, or perhaps more appropriately, a renaissance. BlackBerry attempted to recapture new interest in the service by making it cross-platform. Despite making an honest effort, the BBM's team acknowledges that Facebook has sent messages to WhatsApp and Telegram.
BBM wants to be close to consumers on May 31
Note that this does not affect the enterprise version of BBM, which for all intents and purposes is a separate app altogether.