Don't forget the fact that iOS exploits are cheaper than Android exploits because iOS exploits are so plentiful[1][2].
[1] https://www.theregister.com/2020/05/14/zerodium_ios_flaws/
Apple should follow the law because healthy, robust markets would benefit hundreds of millions of consumers in the US.
Also, they should follow the law because it's the law. They have no problem using the law against their competitors, and even complementary businesses like repair shops, so they should follow it, too.