Why I cannot find google Cantonese input in play store? I watched this video

https://www.youtube.com/watch?v=Jqz3Fv9PcRo

I want to download the same app, the video was just a few months old. However, I could not find the app.

My location is US.
I searched the package name of the app you are talking about is com.google.android.apps.inputmethod.cantonese I didn't find any thing on play store There might be 3 reasons for it

Reason 1 -&gt; The app is not available in your region

Reason 2 -&gt; Your device does not support the App 

Reason 3 -&gt; The App was unlisted from playstore 

the first option seems more likely 

Any way you can always download the APK from external sources , might not be the safest but it works