I suspect that it's because stated and revealed preferences are in divergence here. Stated preferences are that everyone wants no tracking at all. People do not care about data collection in general unless it is egregious (don't tell a teenage girl's dad she's pregnant) but those who do care about data collection care about it greatly. So there is a market for the high-privacy stuff but it is small. And there is a market for the rest that is big.

Any effort you make to go from the latter to the former nets you a dollar less. This is especially true because accidentally collecting data is easy (you build in sync between devices or something).