Google details new 24-hour process to sideload unverified Android apps 4 months ago
What apps do you sideload guys?
I sideload no apps. I install most apps from either F-Droid main, or an other repo.
Why those apps are not in a store?
All of them are in a repository. Just only the state sponsored ID-app is only available via the ad-infected Google RAT delivery service, also known as Google Play.