These solutions don’t really help. I have an app that needs to monitor apps installs, updates, and removal as soon as they occur. The reason is for a list of removed apps, that can appear to the user, and also for a widget:
https://play.google.com/store/apps/details?id=com.lb.app_manager

It doesn’t make sense to have a foreground service just for this, and JobScheduler cannot work using the intent itself, as it can only be used to query after the operation was done (plus it’s not a good thing to poll so often).

I hoped I could convince about this to Google, but failed:
https://issuetracker.google.com/issues/36488260

So I made a suggestion to handle this allow apps to be whitelisted :
https://issuetracker.google.com/issues/36614503