They missed it and Google is now heavily investing in KaiOS pushing Google Assistant and their other services.
I don't think it would be far stretch to start anew in a "new" country ripe for new beginnings. Particularly when their gov is blocking most apps anyways. Good way for Amzn to work into their system without offending their gov. Amzn is a company who will sell your soul to the devil for a penny because there is 7 Billion potential new accts. Btw they have already moved away from android on their Echo devices onto their own RTOS.
I know FB tried and failed to roll out and get adopted with their FB phone, but that's bc they are FB. At this point, failure is their only option. Unfortunately with 2 Billion naive users with no viable alternative, FB death will be slow although they did just provide a "take with you" option of all of your posts so.. may be speeding up? but again to where?