But why? This is information that can most certainly be gleaned from just about any data broker.

Obtaining the actual information is only part of the goal. The main reason is to create a perception in society that “you’ll be found out” which goes toward the goal of removing autonomy of women and turn them back into only ‘baby making machines’.

If you want to see how this plays out, we have an example from history, specifically what Romanian dictator Nicolae Ceaușescu did in 1967 making abortion and contraception outlawed:

From Wikipedia:

To counter this sharp decline in the birth rate, the Communist Party decided that the country’s population should be increased from 20 million to 30 million inhabitants. In October 1966,[1][2] Decree 770 was personally sanctioned by Ceaușescu. Abortion and contraception[citation needed] were declared illegal, except for:

• women over 45 (later lowered to 40, then raised again to 45).
• women who had already borne four children (later raised to five).
• women whose life would be threatened by carrying to term, due to medical complications.
• women who were pregnant through rape and/or incest.

Enforcement:

To enforce the decree, society was strictly controlled. Contraceptives were removed from sale and all women were required to be monitored monthly by a gynecologist.[3]: 6  Any detected pregnancies were followed until birth. The secret police kept a close eye on hospital procedures.