First, go to Setting, general, Software updates, and turn them off.
Second, delay any new Apple purchases for thirty days. It will give you a chance to think before you act.
Lastly, stop replicating any data with #iCloud. Use #Onedrive, or any other service which will scan what you are willing to put in the public cloud. There are lots of resources on the web about how to do this.
In the end, we may still end up buying new iDevices, and putting up with the #invasionofprivacy, but it may just send Apple a message that their money comes from #customers who buy and use their products. Something it appears they’ve forgotten!