Facebook stopped offering Facebook, WhatsApp, Instagram and Messenger apps in Samsung Tizen store. It is not something outdated as Samsung makes lot of good cheap smartphones on Tizen for developing countries.

Not only this - but Facebook also full banned installed applications.

Note the timing also - normally managers try to do such things since October to fit them into Q4, as such way they can guide almost 100% of money they could spend on development to their personal bonus that is paid in November or December (in US). As developers told me - greed of Alphabet and Apple top managers also has no limits, they can kill any good small to medium project if they expect bonuses from it or if they can use this for stock market speculations.