Or because of how much of a larger audience the Play Store has.
Installing an APK from a website has never been an easier process. I do not see how Google can simplify it any more. You are asked 2 things:
- Can we allow your browser to download files?
- Can we install this app on your device?
I would say in addition to the "scary stuff" warnings Google employs on devices, they went out of their way to harm any serious contender for outside distribution.
Epic also went on a significant campaign to be allowed to distribute through Play, but utilize their own payment provider, but Google's monopoly wouldn't budge:
Google's Play Store demands aren't about security, they're about the 30% taxation.
Can you provide references?
On at least four Android phones to allow installing unsigned APKs I've had warnings about "Scary Stuff"[tm]* if I proceed...
* I paraphrase...
It works.