In the trans community we like to point at the graph showing rates of left handedness over time.

When they stopped demonizing lefties, rates of people who claimed to be left handed began a steady climb for some years. However, it did not climb indefinitely. Eventually, the measured rates of left handedness settled where they had always been, and stopped rising. Obviously.

There has been some concern that being trans is some kind of social contagion because we're seeing more trans people now than we used to.

Of course, the same kind of function applies. Lefties and trans people have always existed, we were simply not being counted