The best way to avoid being tracked is to use apps that you pay for, not apps that are free and make money with your data. You can also bookmark websites to your home screen instead of downloading apps, that way you don't grant apps the extra privileges. Finally, you can disable background app refresh.
Nearly all apps, paid or not, use 3rd party analytics tools to improve their engagement. If the app requires sensitive data to function, like your contacts, it's also available to the analytics tool. Even the app's developer might not be aware of what the tools they're using are collecting.
More over: why are you using an analytics system that involves sending your user's data to an arbitrary third party? Someone who is using your app has agreed to a relationship with you, not with facebook, or google, or what have you.
Self-hosted analytics frameworks exist, but unfortunately aren't as popular because of the setup involved.
Personally I'm of the opinion that if you charged a user for your app, and then require that data be provided to an arbitrary third party, then that user should be allowed to get a refund for your product. Similarly if you ship an update that invades a user's privacy then they should be entitled to a refund - you just rob them of functionality (the ability to use your app).
I guess the next step is for Apple to stop allowing analytics URLs to work without an opt in prompt.
No, that's only if you're not using TLS for those domains. Which almost all are at this point.