Call me old fashioned, but if you don't like the services, just stop using them. I have a facebook account - I haven't posted there in 5-6 years. What data are

Call me old fashioned, but if you don't like the services, just stop using them. I have a facebook account - I haven't posted there in 5-6 years. What data are they going to harvest from me that would be at all useful or relevant? I guess they can find the fake email address I signed up with 15 years ago if that's useful for them.