> They also made sure to add scary warnings so one can never offer a normal onboarding flow.

is this any different from Macs also prompting the user when a downloaded binary is suspicious/not signed properly? or windows when installing it'd flash a screen about trusting what you're installing?

It was way worse. They basically made the first install attempt fail. Then they made you go to the Settings app (of course without telling you that you have to go there) to allow it. Then you had to try again to download, which then triggered the scary warnings that you had to accept. This has been changed now though due to EU pressure.