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Google's annoying 'update ownership' sideload warning spreads to more apps and phones
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
If I'm understanding this right, and this basically an API that lets you pick which app store administers an app, that could be quite helpful, not harmful. I currently have fdroid, play store, and Samsung store, and I assume they try to update apps by the fully qualified name, as multiple stores show and try to update a single app instance, sometimes with weird results.
I don't think that's really what this is. This sounds like an additional warning screen, on top of the warning screen you already get when you manually install apps from anything other than the Play Store. I expect you'll still get the same old warning screen even after you pass this screen the one time.
FYI, if you have root there is a Magisk module that gives FDroid the privilege to install apps without the popup.