https://www.bitdefender.com/en-us/blog/hotforsecurity/hacker...
Sure. It’s also not Google’s problem.
It’s not Victorinox’s problem of someone uses a Swiss Army knife to cut someone else. It’s not Toyota’s problem if someone deliberately runs over a pedestrian.
If they don't do that then their reputation will suffer and governments might take notice. So, in practice, big companies do have to care about their users, not individually but in aggregate.
This is like a car manufacturer preventing the installation of all unapproved aftermarket accessories by claiming they're protecting you from a stalker installing a tracker on your car.
1. Most users do not use fdroid or APKs to download software. They download software from the play store.
2. Therefore almost all malware will target the play store.
3. Therefore most malware actively used comes from the play store.
4. Compounded, the play store does almost nothing to prevent malware and actively encourages certain types of malware like spyware and adware.
5. Compounded, Google gets a cut from each piece of malware sold on the play store or advertised on the play store, therefore they have no incentive to prevent malware in any significant way.
This isn't necessarily true even if you're right on all the other points. Even if most malware is on the Play Store, it can still be true that, out of the Android users that DO get malware (or rather, those that actually report malware to Google), most of them got it from outside the Play Store.
It can be true that a minority of users get any malware at all because Play Store is safe, but most users in that minority get malware because they are open to using apps from outside Play Store.
If Google is making this change in service of safety, they would protect a large chunk of that minority, by verifying apps downloaded outside Play Store. If it's necessary for Google to help these users, this change is not "completely unnecessary".