shouldn't there be hundreds if not thousands of Soong type, or close to it, androids out there presumably created by Starfleet??
Read the excellent novel, "Immortal Coil" by Jeffrey Lang. It has cameos by, or mentions of, all the AI featured in TOS and TNG - even homages to "The Questor Tapes" - and is a whodunnit about what happened when Starfleet and Maddox made a new Soong-type android.
Circus Peanut wrote:
Soong was only able to do it twice with Lore and Data
You forgot Juliana Tainer in "Inheritance".