The problem is that in a lot of cases all they need is your agreement for your privacy to be violated - they don't need your data because it's already out there

The problem is that in a lot of cases all they need is your agreement for your privacy to be violated - they don't need your data because it's already out there, they just need your permission to misuse it. Not installing the apps doesn't prevent them from buying your data from various data brokers and feeding back to them.