The issues you are mentioning are very important. I use tech in the same way you do. Trying to get rid of tracking, Google services etc. But this is our free choice.

Forcing that lifestyle upon other people like children will not succeed. They will see it as a personal crusade of you. As soon as they are old enough, they will get their smartphones and use social media heavily.

Better talk to them about the issues of smartphones and social media and let them decide. If they care about privacy, great! Help them to configure their devices. If not, let them go. You cannot control their lifes forever.