Some Android 10 phones are getting Dark mode for the Google Play

It looks like it's still in a testing period, similar to how some got Dark mode in Gmail earlier than most. Google has been hard at work adding dark mode

How to Turn on Dark Theme in Android 10

Google Play Store Finally Gets Dark Theme, Update Begins

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Spark Email Gets Dark Theme on Android

Google Play Store gets dark theme toggle - MSPoweruser

Android Q's dark mode is darker than the Battle of Winterfell - The Verge

Gmail adds dark mode on Android 10, so you won't get blinded by email - CNET

How to Set Up Dark Mode on Your Favorite Apps

Google Play Store shows dark mode on Android 10

How To Get Dark Mode On Android Devices (Older then Android 10)

How to Force-Enable Dark Mode for All Apps in Android 10 « Android :: Gadget Hacks

Android 10 gets Slices, Dark theme for the Google Play Store - Android Community