I wish there was another button on those contact permission boxes which would tell the app you've granted permissions. But when they try to read your contacts, send them randomly generated junk. Fake phone numbers. Fake names.

Or even better, mix in some real names and phone numbers but change all the other details. I want data brokers to think I live in 8 different countries. I want my email address to show up for 50 different identities. Good luck sorting that out.