I had my son on an amazon android tablet the other weekend. Internet access disabled using parental controls. And by the end of that weekend, the tabs that I found opened on the default browser was crazy. All from clicking ads in various apps, auto-play videos, and what not. Ads for viagra, credit cards, home loan applications, other loans, mobile subscription content, etc. Luckily internet access was off so none of them loaded, but I could still see all the failed open tabs.

Tech giants will turn this example around and say "look we need more walled-gardens to protect users". But in reality, as soon as they open the floodgates, there will be solutions that can do the same without giving away more control to Google/Apple. The narrative has to change, and the first step is to give device owners full control.