1) In the EULA
2) They don't. Apple is not preventing you from jailbreaking and using it however you want. They shouldn't be obligated to make it easy for you, especially when there is an open alternative. iOS is Apple's property, I would rather have them make decisions about how it works than the government.
3) MacOS was designed before the internet existed, it has a tiny user base compared to iOS, and it is SIGNIFICANTLY less safe that iOS is, particularly for unsophisticated users..
Or different platforms are allowed different rules. Especially one that is aimed at a significantly more technically proficient user base. It's also harder to take away things that have existed than to prevent them from ever being offered.
So choose the other option.
It absolutely its a free choice. You're not entitled to have your cake and eat it too! You're taking AWAY my choice and telling me I now have more choice. Your preferences are not more important than mine or Apple's.
I prefer Apple's business model, it's safer for me and my family. You or the government shouldn't be allowed to take my choice away when your choice exists in Android.