Recently my phone has been updated to Android 10, with it I found the Digital Wellbeing spyware reinstalled and now fully baked in (no uninstall or disable option).
The prerequisite for this process: you need ADB (the installation of which will not be covered here). No root needed (yet).
Here is the ADB command you need to run:
adb shell pm uninstall -k --user 0 com.google.android.apps.wellbeing
This change is semi-permanent, if you want this nagware back, I can’t really help you (you might be able to reinstall it from the store).
I do not understand the reason one would use this app. If you think you spend too much time on your phone, you don’t need an app to tell you that. My phone is a tool, and having some lock-out and nagging (self-inflicted!) on your own device is absurd.
It is absurd to bake this app in, the only reason is to spy on its users more.
If you hate this app (and everything it stands for) as much as me give it one star on the google play store.