It was working in our app last I tested, but I don't know if we've exercised that path in the last 2 weeks. My expectation is that it should always return false currently and definitely return something.

Which Topic are you asking? I think SignificantAppUpdateTopic should fail if both child and guardian accounts are registered outside of Texas, Utah, or Louisiana.

Other threads: https://developer.apple.com/forums/thread/809829 https://developer.apple.com/forums/thread/810769

I don't believe your assumption is correct. I think the user will always be prompted for permission to share their age range data with an app.

Does Apple plan to cover the legal expenses of developers who are sued due to any delay in this information from Apple or the Apple APIs having bugs?

The Brazil law came into effect on March 17th. If isEligibleForAgeFeatures is not already returning true for Brazilian App Store accounts (I have no way to test this myself), this is a major bug in the Apple system.

This answer does not make clear how the API will reflect the differences between UT and TX laws.