Comment by NotPractical

The only solution to this problem is new legislation. The case that Google fraduently marketed Android is flimsy at best.

People buying phones by and large do not care in the slightest about "openness". Whether or not their phone supports sideloading is completely and utterly irrelevant to them.

But aside from that, it would be enermously difficult to prove that Google made claims that were unequivocally false while advertising Android. Sure, they made some vague claims about Android being an "open" platform. But they had more than enough well-compensated lawyers on their side to avoid making specific promises about specific functionality that could eventually land them in court.

Finally, even if some of the claims Google made about Android in 2015 no longer hold up in 2025, that in and of itself is not illegal. Google is allowed to change and adapt Android over time as it sees fit. Though you and I may disagree with their findings, they have internally identified systemic security threats caused by unrestricted sideloading, and have created a solution to this real-world problem (however flawed it may be). There is no reason under the current laws of the United States that they should not be allowed to make those changes (aside from perhaps general antitrust law, but that is not enough in this instance as evidenced by the outcome of Epic Games' case against Google). Perhaps they will have to change their advertising going into the future, and they can definitely no longer reuse older advertising materials promoting Android's capability for unrestricted sideloading (if those exist). But just because they advertised Android as having feature X in the past does not mean that they would break the law if they were to remove feature X in the future after they stopped running those old ads.

(Yes, it gets a little blurry in the case of software because it often automatically updates and offers no option to downgrade. But phones don't last forever. In the worst case Google could just wait ~5 years from today to implement Developer Verification.)