Well there actually is a problem this can help solve. Malware. There are other concerns that are bigger motivators for Google, but the ability to lock shit down can help control security issues.
Most people can’t get the software they run on their devices. The idea of “you can trust me, bro” is fucking dumb, even in the open-source world. This helps nerf this for the stupid people who buy this shit. It’s a priority because there are more stupid people willing to buy a product and put up with its bullshit than there are smart people willing to put in the effort themselves.
But also money.